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 A205003 #8 Mar 30 2012 18:58:09 %S A205003 1,1,2,3,1,2,2,7,1,1,4,2,5,1,3,15,7,2,8,1,5,3,10,6,2,4,1,4,13,3,14,31, %T A205003 2,6,1,3,17,7,3,5,19,2,20,1,4,9,22,14,3,7,5,2,25,1,8,4,6,12,28,3 %N A205003 The index j<k such that n divides s(k)-s(j), where k is the least index (A205002) for which such j exists, and s(k)=k(k+1)/2. %C A205003 For a guide to related sequences, see A204892. %t A205003 (See the program at A205002.) %Y A205003 Cf. A204892, A205002. %K A205003 nonn %O A205003 1,3 %A A205003 _Clark Kimberling_, Jan 21 2012