Do I have a twin with permutated remainders?












12












$begingroup$


We define $R_n$ as the list of remainders of the Euclidean division of $n$ by $2$, $3$, $5$ and $7$.



Given an integer $nge0$, you have to figure out if there exists an integer $0<k<210$ such that $R_{n+k}$ is a permutation of $R_n$.



Examples



The criterion is met for $n=8$, because:




  • we have $R_8=(0,2,3,1)$

  • for $k=44$, we have $R_{n+k}=R_{52}=(0,1,2,3)$, which is a permutation of $R_8$


The criterion is not met for $n=48$, because:




  • we have $R_{48}=(0,0,3,6)$

  • the smallest integer $k>0$ such that $R_{n+k}$ is a permutation of $R_{48}$ is $k=210$ (leading to $R_{258}=(0,0,3,6)$ as well)


Rules




  • You may either output a truthy value if $k$ exists and a falsy value otherwise, or two distinct and consistent values of your choice.

  • This is code-golf.


Hint




Do you really need to compute $k$? Well, maybe. Or maybe not.




Test cases



Some values of $n$ for which $k$ exists:



3, 4, 5, 8, 30, 100, 200, 2019


Some values of $n$ for which $k$ does not exist:



0, 1, 2, 13, 19, 48, 210, 1999









share|improve this question









$endgroup$












  • $begingroup$
    Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
    $endgroup$
    – Ven
    8 hours ago












  • $begingroup$
    Oh, duh. I get it now.
    $endgroup$
    – Ven
    8 hours ago
















12












$begingroup$


We define $R_n$ as the list of remainders of the Euclidean division of $n$ by $2$, $3$, $5$ and $7$.



Given an integer $nge0$, you have to figure out if there exists an integer $0<k<210$ such that $R_{n+k}$ is a permutation of $R_n$.



Examples



The criterion is met for $n=8$, because:




  • we have $R_8=(0,2,3,1)$

  • for $k=44$, we have $R_{n+k}=R_{52}=(0,1,2,3)$, which is a permutation of $R_8$


The criterion is not met for $n=48$, because:




  • we have $R_{48}=(0,0,3,6)$

  • the smallest integer $k>0$ such that $R_{n+k}$ is a permutation of $R_{48}$ is $k=210$ (leading to $R_{258}=(0,0,3,6)$ as well)


Rules




  • You may either output a truthy value if $k$ exists and a falsy value otherwise, or two distinct and consistent values of your choice.

  • This is code-golf.


Hint




Do you really need to compute $k$? Well, maybe. Or maybe not.




Test cases



Some values of $n$ for which $k$ exists:



3, 4, 5, 8, 30, 100, 200, 2019


Some values of $n$ for which $k$ does not exist:



0, 1, 2, 13, 19, 48, 210, 1999









share|improve this question









$endgroup$












  • $begingroup$
    Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
    $endgroup$
    – Ven
    8 hours ago












  • $begingroup$
    Oh, duh. I get it now.
    $endgroup$
    – Ven
    8 hours ago














12












12








12





$begingroup$


We define $R_n$ as the list of remainders of the Euclidean division of $n$ by $2$, $3$, $5$ and $7$.



Given an integer $nge0$, you have to figure out if there exists an integer $0<k<210$ such that $R_{n+k}$ is a permutation of $R_n$.



Examples



The criterion is met for $n=8$, because:




  • we have $R_8=(0,2,3,1)$

  • for $k=44$, we have $R_{n+k}=R_{52}=(0,1,2,3)$, which is a permutation of $R_8$


The criterion is not met for $n=48$, because:




  • we have $R_{48}=(0,0,3,6)$

  • the smallest integer $k>0$ such that $R_{n+k}$ is a permutation of $R_{48}$ is $k=210$ (leading to $R_{258}=(0,0,3,6)$ as well)


Rules




  • You may either output a truthy value if $k$ exists and a falsy value otherwise, or two distinct and consistent values of your choice.

  • This is code-golf.


Hint




Do you really need to compute $k$? Well, maybe. Or maybe not.




Test cases



Some values of $n$ for which $k$ exists:



3, 4, 5, 8, 30, 100, 200, 2019


Some values of $n$ for which $k$ does not exist:



0, 1, 2, 13, 19, 48, 210, 1999









share|improve this question









$endgroup$




We define $R_n$ as the list of remainders of the Euclidean division of $n$ by $2$, $3$, $5$ and $7$.



Given an integer $nge0$, you have to figure out if there exists an integer $0<k<210$ such that $R_{n+k}$ is a permutation of $R_n$.



Examples



The criterion is met for $n=8$, because:




  • we have $R_8=(0,2,3,1)$

  • for $k=44$, we have $R_{n+k}=R_{52}=(0,1,2,3)$, which is a permutation of $R_8$


The criterion is not met for $n=48$, because:




  • we have $R_{48}=(0,0,3,6)$

  • the smallest integer $k>0$ such that $R_{n+k}$ is a permutation of $R_{48}$ is $k=210$ (leading to $R_{258}=(0,0,3,6)$ as well)


Rules




  • You may either output a truthy value if $k$ exists and a falsy value otherwise, or two distinct and consistent values of your choice.

  • This is code-golf.


Hint




Do you really need to compute $k$? Well, maybe. Or maybe not.




Test cases



Some values of $n$ for which $k$ exists:



3, 4, 5, 8, 30, 100, 200, 2019


Some values of $n$ for which $k$ does not exist:



0, 1, 2, 13, 19, 48, 210, 1999






code-golf decision-problem number-theory






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 9 hours ago









ArnauldArnauld

80.3k797332




80.3k797332












  • $begingroup$
    Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
    $endgroup$
    – Ven
    8 hours ago












  • $begingroup$
    Oh, duh. I get it now.
    $endgroup$
    – Ven
    8 hours ago


















  • $begingroup$
    Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
    $endgroup$
    – Ven
    8 hours ago












  • $begingroup$
    Oh, duh. I get it now.
    $endgroup$
    – Ven
    8 hours ago
















$begingroup$
Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
$endgroup$
– Ven
8 hours ago






$begingroup$
Why can't 2 happen? k=2 = {0,2}; k=2+28={0,2}. Same for 1999 + 42
$endgroup$
– Ven
8 hours ago














$begingroup$
Oh, duh. I get it now.
$endgroup$
– Ven
8 hours ago




$begingroup$
Oh, duh. I get it now.
$endgroup$
– Ven
8 hours ago










11 Answers
11






active

oldest

votes


















8












$begingroup$


R, 63 59 bytes





s=scan()%%c(2,3,5,7);i=which(s<c(0,2,3,5));any(s[i]-s[i-1])


Try it online!



-4 bytes thanks to Giuseppe



(The explanation contains a spoiler as to how to solve the problem without computing $k$.)



Explanation:
Let $s$ be the list of remainders. Note the constraint that s[1]<2, s[2]<3, s[3]<5 and s[4]<7. There exists a $k$ iff there is a permutation of $s$, distinct from $s$, which verifies the constraint. In practice, this will be verified if one of the following conditions is verified:




  • s[2]<2 and s[2]!=s[1]

  • s[3]<3 and s[3]!=s[2]

  • s[4]<5 and s[4]!=s[3]


The code can probably be golfed further.






share|improve this answer










New contributor




Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






$endgroup$





















    4












    $begingroup$


    Haskell, 69 bytes



    Based on the Chinese remainder theorem





    m=[2,3,5,7]
    f x|s<-mod x<$>m=or[m!!a>b|a<-[0..2],b<-drop a s,s!!a/=b]


    Try it online!






    share|improve this answer









    $endgroup$





















      3












      $begingroup$


      C# (Visual C# Interactive Compiler), 125 bytes





      n=>Enumerable.Range(n+1,209).Any(c=>new{c%2,c%3,c%5,c%7}.OrderBy(x=>x).SequenceEqual(new{n%2,n%3,n%5,n%7}.OrderBy(x=>x)))


      Try it online!






      share|improve this answer









      $endgroup$





















        2












        $begingroup$


        Wolfram Language (Mathematica), 67 bytes



        !FreeQ[Sort/@Table[R[#+k],{k,209}],Sort@R@#]&
        R@n_:=n~Mod~{2,3,5,7}


        Try it online!






        share|improve this answer











        $endgroup$





















          2












          $begingroup$


          Perl 6, 64 61 59 bytes





          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}


          Try it online!



          Fixed my bug by changing set to bag :).



          Explanation:



          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}
          my&f={bag($_ X%2,3,5,7)}; # helper function: f
          { $_ }; # takes the implicit argument $_
          X%2,3,5,7 # cross metaoperator with divide: does cross product division
          bag( ) # stores the results in a bag (weighed set, knows how many identical items it contains)
          ($_+1+ ^209) # Generates a range of the argument +1 up to 209+argument+1
          .map(&f) # Apply the helper function for each value in that range
          any( ) # Is any of these bags
          === # Equal to
          f $_ # The helper function result for the given argument?




          Alternative version:



          {my @a=($_+ ^209).map:{bag($_ X%2,3,5,7)};@a.shift===any @a}





          share|improve this answer











          $endgroup$





















            2












            $begingroup$


            Ruby, 54 bytes





            ->n{[2,3,5,7].each_cons(2).any?{|l,h|n%l!=n%h&&n%h<l}}


            Try it online!



            Uses Robin Ryder's clever solution.






            share|improve this answer









            $endgroup$





















              1












              $begingroup$


              R, 72 bytes





              n=scan();b=c(2,3,5,7);for(i in n+1:209)F=F|all(sort(n%%b)==sort(i%%b));F


              Try it online!






              share|improve this answer









              $endgroup$





















                1












                $begingroup$


                Jelly, 15 bytes



                8ÆR©PḶ+%Ṣ¥€®ċḢ$


                Try it online!



                I’m sure there’s a golfier answer. I’ve interpreted a truthy value as being anything that isn’t zero, so here it’s the number of possible values of k. If it needs to be two distinct values that costs me a further byte.






                share|improve this answer









                $endgroup$









                • 1




                  $begingroup$
                  All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                  $endgroup$
                  – Jonathan Allan
                  6 hours ago










                • $begingroup$
                  Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                  $endgroup$
                  – Jonathan Allan
                  6 hours ago










                • $begingroup$
                  @JonathanAllan yes of course, thanks. :)
                  $endgroup$
                  – Nick Kennedy
                  6 hours ago





















                1












                $begingroup$


                PHP, 81 78 72 bytes





                while($y<3)if($argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u)die(T);


                A riff on @Robin Ryder's answer. Input is via STDIN, output is 'T' if truthy, and empty '' if falsy.



                $ echo 3|php -nF euc.php
                T
                $ echo 5|php -nF euc.php
                T
                $ echo 2019|php -nF euc.php
                T
                $ echo 0|php -nF euc.php

                $ echo 2|php -nF euc.php

                $ echo 1999|php -nF euc.php


                Try it online!



                Or 73 bytes with 1 or 0 response



                while($y<3)$r|=$argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u;echo$r;



                $ echo 2019|php -nF euc.php
                1
                $ echo 1999|php -nF euc.php
                0


                Try it online (all test cases)!



                Original answer, 133 127 bytes



                function($n){while(++$k<210)if(($r=function($n){foreach([2,3,5,7]as$d)$o=$n%$d;sort($o);return$o;})($n+$k)==$r($n))return 1;}


                Try it online!






                share|improve this answer











                $endgroup$





















                  1












                  $begingroup$


                  Python 2, 41 bytes





                  lambda n:n%5!=n%7<5or n%3!=n%5<3or-~n%6/4


                  Try it online!



                  Uses the same characterization as Robin Ryder. The check n%2!=n%3<2 is shortened to -~n%6/4. Writing the the three conditions turned out shorter than writing a general one:



                  46 bytes





                  lambda n:any(n%p!=n%(p+1|1)<p for p in[2,3,5])


                  Try it online!





                  share











                  $endgroup$





















                    0












                    $begingroup$


                    Python 3, 69 bytes





                    lambda x:int('4LR2991ODO5GS2974QWH22YTLL3E3I6TDADQG87I0',36)&1<<x%210


                    Try it online!



                    Hardcoded






                    share|improve this answer









                    $endgroup$














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                      11 Answers
                      11






                      active

                      oldest

                      votes








                      11 Answers
                      11






                      active

                      oldest

                      votes









                      active

                      oldest

                      votes






                      active

                      oldest

                      votes









                      8












                      $begingroup$


                      R, 63 59 bytes





                      s=scan()%%c(2,3,5,7);i=which(s<c(0,2,3,5));any(s[i]-s[i-1])


                      Try it online!



                      -4 bytes thanks to Giuseppe



                      (The explanation contains a spoiler as to how to solve the problem without computing $k$.)



                      Explanation:
                      Let $s$ be the list of remainders. Note the constraint that s[1]<2, s[2]<3, s[3]<5 and s[4]<7. There exists a $k$ iff there is a permutation of $s$, distinct from $s$, which verifies the constraint. In practice, this will be verified if one of the following conditions is verified:




                      • s[2]<2 and s[2]!=s[1]

                      • s[3]<3 and s[3]!=s[2]

                      • s[4]<5 and s[4]!=s[3]


                      The code can probably be golfed further.






                      share|improve this answer










                      New contributor




                      Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                      Check out our Code of Conduct.






                      $endgroup$


















                        8












                        $begingroup$


                        R, 63 59 bytes





                        s=scan()%%c(2,3,5,7);i=which(s<c(0,2,3,5));any(s[i]-s[i-1])


                        Try it online!



                        -4 bytes thanks to Giuseppe



                        (The explanation contains a spoiler as to how to solve the problem without computing $k$.)



                        Explanation:
                        Let $s$ be the list of remainders. Note the constraint that s[1]<2, s[2]<3, s[3]<5 and s[4]<7. There exists a $k$ iff there is a permutation of $s$, distinct from $s$, which verifies the constraint. In practice, this will be verified if one of the following conditions is verified:




                        • s[2]<2 and s[2]!=s[1]

                        • s[3]<3 and s[3]!=s[2]

                        • s[4]<5 and s[4]!=s[3]


                        The code can probably be golfed further.






                        share|improve this answer










                        New contributor




                        Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                        Check out our Code of Conduct.






                        $endgroup$
















                          8












                          8








                          8





                          $begingroup$


                          R, 63 59 bytes





                          s=scan()%%c(2,3,5,7);i=which(s<c(0,2,3,5));any(s[i]-s[i-1])


                          Try it online!



                          -4 bytes thanks to Giuseppe



                          (The explanation contains a spoiler as to how to solve the problem without computing $k$.)



                          Explanation:
                          Let $s$ be the list of remainders. Note the constraint that s[1]<2, s[2]<3, s[3]<5 and s[4]<7. There exists a $k$ iff there is a permutation of $s$, distinct from $s$, which verifies the constraint. In practice, this will be verified if one of the following conditions is verified:




                          • s[2]<2 and s[2]!=s[1]

                          • s[3]<3 and s[3]!=s[2]

                          • s[4]<5 and s[4]!=s[3]


                          The code can probably be golfed further.






                          share|improve this answer










                          New contributor




                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.






                          $endgroup$




                          R, 63 59 bytes





                          s=scan()%%c(2,3,5,7);i=which(s<c(0,2,3,5));any(s[i]-s[i-1])


                          Try it online!



                          -4 bytes thanks to Giuseppe



                          (The explanation contains a spoiler as to how to solve the problem without computing $k$.)



                          Explanation:
                          Let $s$ be the list of remainders. Note the constraint that s[1]<2, s[2]<3, s[3]<5 and s[4]<7. There exists a $k$ iff there is a permutation of $s$, distinct from $s$, which verifies the constraint. In practice, this will be verified if one of the following conditions is verified:




                          • s[2]<2 and s[2]!=s[1]

                          • s[3]<3 and s[3]!=s[2]

                          • s[4]<5 and s[4]!=s[3]


                          The code can probably be golfed further.







                          share|improve this answer










                          New contributor




                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.









                          share|improve this answer



                          share|improve this answer








                          edited 6 hours ago





















                          New contributor




                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.









                          answered 7 hours ago









                          Robin RyderRobin Ryder

                          4116




                          4116




                          New contributor




                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.





                          New contributor





                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.






                          Robin Ryder is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                          Check out our Code of Conduct.























                              4












                              $begingroup$


                              Haskell, 69 bytes



                              Based on the Chinese remainder theorem





                              m=[2,3,5,7]
                              f x|s<-mod x<$>m=or[m!!a>b|a<-[0..2],b<-drop a s,s!!a/=b]


                              Try it online!






                              share|improve this answer









                              $endgroup$


















                                4












                                $begingroup$


                                Haskell, 69 bytes



                                Based on the Chinese remainder theorem





                                m=[2,3,5,7]
                                f x|s<-mod x<$>m=or[m!!a>b|a<-[0..2],b<-drop a s,s!!a/=b]


                                Try it online!






                                share|improve this answer









                                $endgroup$
















                                  4












                                  4








                                  4





                                  $begingroup$


                                  Haskell, 69 bytes



                                  Based on the Chinese remainder theorem





                                  m=[2,3,5,7]
                                  f x|s<-mod x<$>m=or[m!!a>b|a<-[0..2],b<-drop a s,s!!a/=b]


                                  Try it online!






                                  share|improve this answer









                                  $endgroup$




                                  Haskell, 69 bytes



                                  Based on the Chinese remainder theorem





                                  m=[2,3,5,7]
                                  f x|s<-mod x<$>m=or[m!!a>b|a<-[0..2],b<-drop a s,s!!a/=b]


                                  Try it online!







                                  share|improve this answer












                                  share|improve this answer



                                  share|improve this answer










                                  answered 7 hours ago









                                  H.PWizH.PWiz

                                  10.3k21351




                                  10.3k21351























                                      3












                                      $begingroup$


                                      C# (Visual C# Interactive Compiler), 125 bytes





                                      n=>Enumerable.Range(n+1,209).Any(c=>new{c%2,c%3,c%5,c%7}.OrderBy(x=>x).SequenceEqual(new{n%2,n%3,n%5,n%7}.OrderBy(x=>x)))


                                      Try it online!






                                      share|improve this answer









                                      $endgroup$


















                                        3












                                        $begingroup$


                                        C# (Visual C# Interactive Compiler), 125 bytes





                                        n=>Enumerable.Range(n+1,209).Any(c=>new{c%2,c%3,c%5,c%7}.OrderBy(x=>x).SequenceEqual(new{n%2,n%3,n%5,n%7}.OrderBy(x=>x)))


                                        Try it online!






                                        share|improve this answer









                                        $endgroup$
















                                          3












                                          3








                                          3





                                          $begingroup$


                                          C# (Visual C# Interactive Compiler), 125 bytes





                                          n=>Enumerable.Range(n+1,209).Any(c=>new{c%2,c%3,c%5,c%7}.OrderBy(x=>x).SequenceEqual(new{n%2,n%3,n%5,n%7}.OrderBy(x=>x)))


                                          Try it online!






                                          share|improve this answer









                                          $endgroup$




                                          C# (Visual C# Interactive Compiler), 125 bytes





                                          n=>Enumerable.Range(n+1,209).Any(c=>new{c%2,c%3,c%5,c%7}.OrderBy(x=>x).SequenceEqual(new{n%2,n%3,n%5,n%7}.OrderBy(x=>x)))


                                          Try it online!







                                          share|improve this answer












                                          share|improve this answer



                                          share|improve this answer










                                          answered 8 hours ago









                                          Embodiment of IgnoranceEmbodiment of Ignorance

                                          2,718126




                                          2,718126























                                              2












                                              $begingroup$


                                              Wolfram Language (Mathematica), 67 bytes



                                              !FreeQ[Sort/@Table[R[#+k],{k,209}],Sort@R@#]&
                                              R@n_:=n~Mod~{2,3,5,7}


                                              Try it online!






                                              share|improve this answer











                                              $endgroup$


















                                                2












                                                $begingroup$


                                                Wolfram Language (Mathematica), 67 bytes



                                                !FreeQ[Sort/@Table[R[#+k],{k,209}],Sort@R@#]&
                                                R@n_:=n~Mod~{2,3,5,7}


                                                Try it online!






                                                share|improve this answer











                                                $endgroup$
















                                                  2












                                                  2








                                                  2





                                                  $begingroup$


                                                  Wolfram Language (Mathematica), 67 bytes



                                                  !FreeQ[Sort/@Table[R[#+k],{k,209}],Sort@R@#]&
                                                  R@n_:=n~Mod~{2,3,5,7}


                                                  Try it online!






                                                  share|improve this answer











                                                  $endgroup$




                                                  Wolfram Language (Mathematica), 67 bytes



                                                  !FreeQ[Sort/@Table[R[#+k],{k,209}],Sort@R@#]&
                                                  R@n_:=n~Mod~{2,3,5,7}


                                                  Try it online!







                                                  share|improve this answer














                                                  share|improve this answer



                                                  share|improve this answer








                                                  edited 8 hours ago

























                                                  answered 8 hours ago









                                                  J42161217J42161217

                                                  13.8k21253




                                                  13.8k21253























                                                      2












                                                      $begingroup$


                                                      Perl 6, 64 61 59 bytes





                                                      {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}


                                                      Try it online!



                                                      Fixed my bug by changing set to bag :).



                                                      Explanation:



                                                      {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}
                                                      my&f={bag($_ X%2,3,5,7)}; # helper function: f
                                                      { $_ }; # takes the implicit argument $_
                                                      X%2,3,5,7 # cross metaoperator with divide: does cross product division
                                                      bag( ) # stores the results in a bag (weighed set, knows how many identical items it contains)
                                                      ($_+1+ ^209) # Generates a range of the argument +1 up to 209+argument+1
                                                      .map(&f) # Apply the helper function for each value in that range
                                                      any( ) # Is any of these bags
                                                      === # Equal to
                                                      f $_ # The helper function result for the given argument?




                                                      Alternative version:



                                                      {my @a=($_+ ^209).map:{bag($_ X%2,3,5,7)};@a.shift===any @a}





                                                      share|improve this answer











                                                      $endgroup$


















                                                        2












                                                        $begingroup$


                                                        Perl 6, 64 61 59 bytes





                                                        {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}


                                                        Try it online!



                                                        Fixed my bug by changing set to bag :).



                                                        Explanation:



                                                        {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}
                                                        my&f={bag($_ X%2,3,5,7)}; # helper function: f
                                                        { $_ }; # takes the implicit argument $_
                                                        X%2,3,5,7 # cross metaoperator with divide: does cross product division
                                                        bag( ) # stores the results in a bag (weighed set, knows how many identical items it contains)
                                                        ($_+1+ ^209) # Generates a range of the argument +1 up to 209+argument+1
                                                        .map(&f) # Apply the helper function for each value in that range
                                                        any( ) # Is any of these bags
                                                        === # Equal to
                                                        f $_ # The helper function result for the given argument?




                                                        Alternative version:



                                                        {my @a=($_+ ^209).map:{bag($_ X%2,3,5,7)};@a.shift===any @a}





                                                        share|improve this answer











                                                        $endgroup$
















                                                          2












                                                          2








                                                          2





                                                          $begingroup$


                                                          Perl 6, 64 61 59 bytes





                                                          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}


                                                          Try it online!



                                                          Fixed my bug by changing set to bag :).



                                                          Explanation:



                                                          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}
                                                          my&f={bag($_ X%2,3,5,7)}; # helper function: f
                                                          { $_ }; # takes the implicit argument $_
                                                          X%2,3,5,7 # cross metaoperator with divide: does cross product division
                                                          bag( ) # stores the results in a bag (weighed set, knows how many identical items it contains)
                                                          ($_+1+ ^209) # Generates a range of the argument +1 up to 209+argument+1
                                                          .map(&f) # Apply the helper function for each value in that range
                                                          any( ) # Is any of these bags
                                                          === # Equal to
                                                          f $_ # The helper function result for the given argument?




                                                          Alternative version:



                                                          {my @a=($_+ ^209).map:{bag($_ X%2,3,5,7)};@a.shift===any @a}





                                                          share|improve this answer











                                                          $endgroup$




                                                          Perl 6, 64 61 59 bytes





                                                          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}


                                                          Try it online!



                                                          Fixed my bug by changing set to bag :).



                                                          Explanation:



                                                          {my&f={bag($_ X%2,3,5,7)};any(($_+1+ ^209).map(&f))===f $_}
                                                          my&f={bag($_ X%2,3,5,7)}; # helper function: f
                                                          { $_ }; # takes the implicit argument $_
                                                          X%2,3,5,7 # cross metaoperator with divide: does cross product division
                                                          bag( ) # stores the results in a bag (weighed set, knows how many identical items it contains)
                                                          ($_+1+ ^209) # Generates a range of the argument +1 up to 209+argument+1
                                                          .map(&f) # Apply the helper function for each value in that range
                                                          any( ) # Is any of these bags
                                                          === # Equal to
                                                          f $_ # The helper function result for the given argument?




                                                          Alternative version:



                                                          {my @a=($_+ ^209).map:{bag($_ X%2,3,5,7)};@a.shift===any @a}






                                                          share|improve this answer














                                                          share|improve this answer



                                                          share|improve this answer








                                                          edited 8 hours ago

























                                                          answered 8 hours ago









                                                          VenVen

                                                          2,50511223




                                                          2,50511223























                                                              2












                                                              $begingroup$


                                                              Ruby, 54 bytes





                                                              ->n{[2,3,5,7].each_cons(2).any?{|l,h|n%l!=n%h&&n%h<l}}


                                                              Try it online!



                                                              Uses Robin Ryder's clever solution.






                                                              share|improve this answer









                                                              $endgroup$


















                                                                2












                                                                $begingroup$


                                                                Ruby, 54 bytes





                                                                ->n{[2,3,5,7].each_cons(2).any?{|l,h|n%l!=n%h&&n%h<l}}


                                                                Try it online!



                                                                Uses Robin Ryder's clever solution.






                                                                share|improve this answer









                                                                $endgroup$
















                                                                  2












                                                                  2








                                                                  2





                                                                  $begingroup$


                                                                  Ruby, 54 bytes





                                                                  ->n{[2,3,5,7].each_cons(2).any?{|l,h|n%l!=n%h&&n%h<l}}


                                                                  Try it online!



                                                                  Uses Robin Ryder's clever solution.






                                                                  share|improve this answer









                                                                  $endgroup$




                                                                  Ruby, 54 bytes





                                                                  ->n{[2,3,5,7].each_cons(2).any?{|l,h|n%l!=n%h&&n%h<l}}


                                                                  Try it online!



                                                                  Uses Robin Ryder's clever solution.







                                                                  share|improve this answer












                                                                  share|improve this answer



                                                                  share|improve this answer










                                                                  answered 5 hours ago









                                                                  histocrathistocrat

                                                                  19.2k43173




                                                                  19.2k43173























                                                                      1












                                                                      $begingroup$


                                                                      R, 72 bytes





                                                                      n=scan();b=c(2,3,5,7);for(i in n+1:209)F=F|all(sort(n%%b)==sort(i%%b));F


                                                                      Try it online!






                                                                      share|improve this answer









                                                                      $endgroup$


















                                                                        1












                                                                        $begingroup$


                                                                        R, 72 bytes





                                                                        n=scan();b=c(2,3,5,7);for(i in n+1:209)F=F|all(sort(n%%b)==sort(i%%b));F


                                                                        Try it online!






                                                                        share|improve this answer









                                                                        $endgroup$
















                                                                          1












                                                                          1








                                                                          1





                                                                          $begingroup$


                                                                          R, 72 bytes





                                                                          n=scan();b=c(2,3,5,7);for(i in n+1:209)F=F|all(sort(n%%b)==sort(i%%b));F


                                                                          Try it online!






                                                                          share|improve this answer









                                                                          $endgroup$




                                                                          R, 72 bytes





                                                                          n=scan();b=c(2,3,5,7);for(i in n+1:209)F=F|all(sort(n%%b)==sort(i%%b));F


                                                                          Try it online!







                                                                          share|improve this answer












                                                                          share|improve this answer



                                                                          share|improve this answer










                                                                          answered 7 hours ago









                                                                          Aaron HaymanAaron Hayman

                                                                          3516




                                                                          3516























                                                                              1












                                                                              $begingroup$


                                                                              Jelly, 15 bytes



                                                                              8ÆR©PḶ+%Ṣ¥€®ċḢ$


                                                                              Try it online!



                                                                              I’m sure there’s a golfier answer. I’ve interpreted a truthy value as being anything that isn’t zero, so here it’s the number of possible values of k. If it needs to be two distinct values that costs me a further byte.






                                                                              share|improve this answer









                                                                              $endgroup$









                                                                              • 1




                                                                                $begingroup$
                                                                                All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                @JonathanAllan yes of course, thanks. :)
                                                                                $endgroup$
                                                                                – Nick Kennedy
                                                                                6 hours ago


















                                                                              1












                                                                              $begingroup$


                                                                              Jelly, 15 bytes



                                                                              8ÆR©PḶ+%Ṣ¥€®ċḢ$


                                                                              Try it online!



                                                                              I’m sure there’s a golfier answer. I’ve interpreted a truthy value as being anything that isn’t zero, so here it’s the number of possible values of k. If it needs to be two distinct values that costs me a further byte.






                                                                              share|improve this answer









                                                                              $endgroup$









                                                                              • 1




                                                                                $begingroup$
                                                                                All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                @JonathanAllan yes of course, thanks. :)
                                                                                $endgroup$
                                                                                – Nick Kennedy
                                                                                6 hours ago
















                                                                              1












                                                                              1








                                                                              1





                                                                              $begingroup$


                                                                              Jelly, 15 bytes



                                                                              8ÆR©PḶ+%Ṣ¥€®ċḢ$


                                                                              Try it online!



                                                                              I’m sure there’s a golfier answer. I’ve interpreted a truthy value as being anything that isn’t zero, so here it’s the number of possible values of k. If it needs to be two distinct values that costs me a further byte.






                                                                              share|improve this answer









                                                                              $endgroup$




                                                                              Jelly, 15 bytes



                                                                              8ÆR©PḶ+%Ṣ¥€®ċḢ$


                                                                              Try it online!



                                                                              I’m sure there’s a golfier answer. I’ve interpreted a truthy value as being anything that isn’t zero, so here it’s the number of possible values of k. If it needs to be two distinct values that costs me a further byte.







                                                                              share|improve this answer












                                                                              share|improve this answer



                                                                              share|improve this answer










                                                                              answered 6 hours ago









                                                                              Nick KennedyNick Kennedy

                                                                              1,31649




                                                                              1,31649








                                                                              • 1




                                                                                $begingroup$
                                                                                All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                @JonathanAllan yes of course, thanks. :)
                                                                                $endgroup$
                                                                                – Nick Kennedy
                                                                                6 hours ago
















                                                                              • 1




                                                                                $begingroup$
                                                                                All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                                $endgroup$
                                                                                – Jonathan Allan
                                                                                6 hours ago










                                                                              • $begingroup$
                                                                                @JonathanAllan yes of course, thanks. :)
                                                                                $endgroup$
                                                                                – Nick Kennedy
                                                                                6 hours ago










                                                                              1




                                                                              1




                                                                              $begingroup$
                                                                              All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                              $endgroup$
                                                                              – Jonathan Allan
                                                                              6 hours ago




                                                                              $begingroup$
                                                                              All good regarding truthy vs falsey. Using the meta agreed definition of truthy and falsey (effectively "what does the language's if-else construct do if there is one) zero is falsey and non-zeros are truthy (? is the if-else construct in Jelly; for some languages it's a harder question).
                                                                              $endgroup$
                                                                              – Jonathan Allan
                                                                              6 hours ago












                                                                              $begingroup$
                                                                              Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                              $endgroup$
                                                                              – Jonathan Allan
                                                                              6 hours ago




                                                                              $begingroup$
                                                                              Oh, and you could get distinct values for no cost with Ḣe$ if you wanted :)
                                                                              $endgroup$
                                                                              – Jonathan Allan
                                                                              6 hours ago












                                                                              $begingroup$
                                                                              @JonathanAllan yes of course, thanks. :)
                                                                              $endgroup$
                                                                              – Nick Kennedy
                                                                              6 hours ago






                                                                              $begingroup$
                                                                              @JonathanAllan yes of course, thanks. :)
                                                                              $endgroup$
                                                                              – Nick Kennedy
                                                                              6 hours ago













                                                                              1












                                                                              $begingroup$


                                                                              PHP, 81 78 72 bytes





                                                                              while($y<3)if($argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u)die(T);


                                                                              A riff on @Robin Ryder's answer. Input is via STDIN, output is 'T' if truthy, and empty '' if falsy.



                                                                              $ echo 3|php -nF euc.php
                                                                              T
                                                                              $ echo 5|php -nF euc.php
                                                                              T
                                                                              $ echo 2019|php -nF euc.php
                                                                              T
                                                                              $ echo 0|php -nF euc.php

                                                                              $ echo 2|php -nF euc.php

                                                                              $ echo 1999|php -nF euc.php


                                                                              Try it online!



                                                                              Or 73 bytes with 1 or 0 response



                                                                              while($y<3)$r|=$argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u;echo$r;



                                                                              $ echo 2019|php -nF euc.php
                                                                              1
                                                                              $ echo 1999|php -nF euc.php
                                                                              0


                                                                              Try it online (all test cases)!



                                                                              Original answer, 133 127 bytes



                                                                              function($n){while(++$k<210)if(($r=function($n){foreach([2,3,5,7]as$d)$o=$n%$d;sort($o);return$o;})($n+$k)==$r($n))return 1;}


                                                                              Try it online!






                                                                              share|improve this answer











                                                                              $endgroup$


















                                                                                1












                                                                                $begingroup$


                                                                                PHP, 81 78 72 bytes





                                                                                while($y<3)if($argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u)die(T);


                                                                                A riff on @Robin Ryder's answer. Input is via STDIN, output is 'T' if truthy, and empty '' if falsy.



                                                                                $ echo 3|php -nF euc.php
                                                                                T
                                                                                $ echo 5|php -nF euc.php
                                                                                T
                                                                                $ echo 2019|php -nF euc.php
                                                                                T
                                                                                $ echo 0|php -nF euc.php

                                                                                $ echo 2|php -nF euc.php

                                                                                $ echo 1999|php -nF euc.php


                                                                                Try it online!



                                                                                Or 73 bytes with 1 or 0 response



                                                                                while($y<3)$r|=$argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u;echo$r;



                                                                                $ echo 2019|php -nF euc.php
                                                                                1
                                                                                $ echo 1999|php -nF euc.php
                                                                                0


                                                                                Try it online (all test cases)!



                                                                                Original answer, 133 127 bytes



                                                                                function($n){while(++$k<210)if(($r=function($n){foreach([2,3,5,7]as$d)$o=$n%$d;sort($o);return$o;})($n+$k)==$r($n))return 1;}


                                                                                Try it online!






                                                                                share|improve this answer











                                                                                $endgroup$
















                                                                                  1












                                                                                  1








                                                                                  1





                                                                                  $begingroup$


                                                                                  PHP, 81 78 72 bytes





                                                                                  while($y<3)if($argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u)die(T);


                                                                                  A riff on @Robin Ryder's answer. Input is via STDIN, output is 'T' if truthy, and empty '' if falsy.



                                                                                  $ echo 3|php -nF euc.php
                                                                                  T
                                                                                  $ echo 5|php -nF euc.php
                                                                                  T
                                                                                  $ echo 2019|php -nF euc.php
                                                                                  T
                                                                                  $ echo 0|php -nF euc.php

                                                                                  $ echo 2|php -nF euc.php

                                                                                  $ echo 1999|php -nF euc.php


                                                                                  Try it online!



                                                                                  Or 73 bytes with 1 or 0 response



                                                                                  while($y<3)$r|=$argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u;echo$r;



                                                                                  $ echo 2019|php -nF euc.php
                                                                                  1
                                                                                  $ echo 1999|php -nF euc.php
                                                                                  0


                                                                                  Try it online (all test cases)!



                                                                                  Original answer, 133 127 bytes



                                                                                  function($n){while(++$k<210)if(($r=function($n){foreach([2,3,5,7]as$d)$o=$n%$d;sort($o);return$o;})($n+$k)==$r($n))return 1;}


                                                                                  Try it online!






                                                                                  share|improve this answer











                                                                                  $endgroup$




                                                                                  PHP, 81 78 72 bytes





                                                                                  while($y<3)if($argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u)die(T);


                                                                                  A riff on @Robin Ryder's answer. Input is via STDIN, output is 'T' if truthy, and empty '' if falsy.



                                                                                  $ echo 3|php -nF euc.php
                                                                                  T
                                                                                  $ echo 5|php -nF euc.php
                                                                                  T
                                                                                  $ echo 2019|php -nF euc.php
                                                                                  T
                                                                                  $ echo 0|php -nF euc.php

                                                                                  $ echo 2|php -nF euc.php

                                                                                  $ echo 1999|php -nF euc.php


                                                                                  Try it online!



                                                                                  Or 73 bytes with 1 or 0 response



                                                                                  while($y<3)$r|=$argn%($u='235'[$y])!=($b=$argn%'357'[$y++])&$b<$u;echo$r;



                                                                                  $ echo 2019|php -nF euc.php
                                                                                  1
                                                                                  $ echo 1999|php -nF euc.php
                                                                                  0


                                                                                  Try it online (all test cases)!



                                                                                  Original answer, 133 127 bytes



                                                                                  function($n){while(++$k<210)if(($r=function($n){foreach([2,3,5,7]as$d)$o=$n%$d;sort($o);return$o;})($n+$k)==$r($n))return 1;}


                                                                                  Try it online!







                                                                                  share|improve this answer














                                                                                  share|improve this answer



                                                                                  share|improve this answer








                                                                                  edited 5 hours ago

























                                                                                  answered 8 hours ago









                                                                                  gwaughgwaugh

                                                                                  1,998517




                                                                                  1,998517























                                                                                      1












                                                                                      $begingroup$


                                                                                      Python 2, 41 bytes





                                                                                      lambda n:n%5!=n%7<5or n%3!=n%5<3or-~n%6/4


                                                                                      Try it online!



                                                                                      Uses the same characterization as Robin Ryder. The check n%2!=n%3<2 is shortened to -~n%6/4. Writing the the three conditions turned out shorter than writing a general one:



                                                                                      46 bytes





                                                                                      lambda n:any(n%p!=n%(p+1|1)<p for p in[2,3,5])


                                                                                      Try it online!





                                                                                      share











                                                                                      $endgroup$


















                                                                                        1












                                                                                        $begingroup$


                                                                                        Python 2, 41 bytes





                                                                                        lambda n:n%5!=n%7<5or n%3!=n%5<3or-~n%6/4


                                                                                        Try it online!



                                                                                        Uses the same characterization as Robin Ryder. The check n%2!=n%3<2 is shortened to -~n%6/4. Writing the the three conditions turned out shorter than writing a general one:



                                                                                        46 bytes





                                                                                        lambda n:any(n%p!=n%(p+1|1)<p for p in[2,3,5])


                                                                                        Try it online!





                                                                                        share











                                                                                        $endgroup$
















                                                                                          1












                                                                                          1








                                                                                          1





                                                                                          $begingroup$


                                                                                          Python 2, 41 bytes





                                                                                          lambda n:n%5!=n%7<5or n%3!=n%5<3or-~n%6/4


                                                                                          Try it online!



                                                                                          Uses the same characterization as Robin Ryder. The check n%2!=n%3<2 is shortened to -~n%6/4. Writing the the three conditions turned out shorter than writing a general one:



                                                                                          46 bytes





                                                                                          lambda n:any(n%p!=n%(p+1|1)<p for p in[2,3,5])


                                                                                          Try it online!





                                                                                          share











                                                                                          $endgroup$




                                                                                          Python 2, 41 bytes





                                                                                          lambda n:n%5!=n%7<5or n%3!=n%5<3or-~n%6/4


                                                                                          Try it online!



                                                                                          Uses the same characterization as Robin Ryder. The check n%2!=n%3<2 is shortened to -~n%6/4. Writing the the three conditions turned out shorter than writing a general one:



                                                                                          46 bytes





                                                                                          lambda n:any(n%p!=n%(p+1|1)<p for p in[2,3,5])


                                                                                          Try it online!






                                                                                          share













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                                                                                          edited 1 min ago

























                                                                                          answered 8 mins ago









                                                                                          xnorxnor

                                                                                          93.2k18190448




                                                                                          93.2k18190448























                                                                                              0












                                                                                              $begingroup$


                                                                                              Python 3, 69 bytes





                                                                                              lambda x:int('4LR2991ODO5GS2974QWH22YTLL3E3I6TDADQG87I0',36)&1<<x%210


                                                                                              Try it online!



                                                                                              Hardcoded






                                                                                              share|improve this answer









                                                                                              $endgroup$


















                                                                                                0












                                                                                                $begingroup$


                                                                                                Python 3, 69 bytes





                                                                                                lambda x:int('4LR2991ODO5GS2974QWH22YTLL3E3I6TDADQG87I0',36)&1<<x%210


                                                                                                Try it online!



                                                                                                Hardcoded






                                                                                                share|improve this answer









                                                                                                $endgroup$
















                                                                                                  0












                                                                                                  0








                                                                                                  0





                                                                                                  $begingroup$


                                                                                                  Python 3, 69 bytes





                                                                                                  lambda x:int('4LR2991ODO5GS2974QWH22YTLL3E3I6TDADQG87I0',36)&1<<x%210


                                                                                                  Try it online!



                                                                                                  Hardcoded






                                                                                                  share|improve this answer









                                                                                                  $endgroup$




                                                                                                  Python 3, 69 bytes





                                                                                                  lambda x:int('4LR2991ODO5GS2974QWH22YTLL3E3I6TDADQG87I0',36)&1<<x%210


                                                                                                  Try it online!



                                                                                                  Hardcoded







                                                                                                  share|improve this answer












                                                                                                  share|improve this answer



                                                                                                  share|improve this answer










                                                                                                  answered 2 hours ago









                                                                                                  attinatattinat

                                                                                                  4597




                                                                                                  4597






























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