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 A204909 #8 Mar 30 2012 18:58:08 %S A204909 1,1,1,2,2,1,1,1,1,2,2,1,1,1,2,2,2,1,1,3,1,2,2,1,3,1,1,4,4,2,1,1,1,2, %T A204909 4,1,1,1,1,2,2,1,3,5,2,2,2,1,1,3 %N A204909 The index j<k such that n divides s(k)-s(j), where k is the least index (A204908) for which such j exists. %C A204909 For a guide to related sequences, see A204892. %t A204909 (See the program at A204908.) %Y A204909 Cf. A204908, A204900, A204892. %K A204909 nonn %O A204909 1,4 %A A204909 _Clark Kimberling_, Jan 20 2012