This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A205137 #5 Mar 30 2012 18:58:10 %S A205137 1,1,4,1,6,8,3,15,37,6,2,19,10,25,8,15,5,37,21,24,4,28,9,19,11,75,352, %T A205137 30,14,8,55,231,34,7,20,37,78,150,13,24,27,53,105,95,70,12,35,19,72, %U A205137 11,76,98,44,380,41,30,26,18,54,103 %N A205137 Least k such that n divides a difference between distinct pentagonal numbers when the differences are ordered as in A205136. %C A205137 For a guide to related sequences, see A204892. %t A205137 (See the program at A205138.) %Y A205137 Cf. A205138, A204892. %K A205137 nonn %O A205137 1,3 %A A205137 _Clark Kimberling_, Jan 25 2012