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 A205140 #9 Apr 09 2015 16:35:05 %S A205140 5,5,22,5,22,35,12,51,145,22,12,70,35,92,35,51,22,145,70,92,22,92,35, %T A205140 70,51,247,1162,117,51,35,176,715,117,35,70,145,247,477,51,92,92,176, %U A205140 330,330,247,51,117,70,247,51,247,330,145,1247,145,117,92,70 %N A205140 Least s(k) such that n divides s(k)-s(j) for some j<k, where s(j)=j(3j-1)/2, the j-th pentagonal number. %C A205140 For a guide to related sequences, see A204892. %t A205140 (See the program at A205138.) %Y A205140 Cf. A204892, A205138. %K A205140 nonn %O A205140 1,1 %A A205140 _Clark Kimberling_, Jan 25 2012