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 A205387 #7 Dec 25 2023 18:17:19 %S A205387 1,1,1,2,3,5,2,2,1,5,6,5,4,5,5,2,1,3,6,4,5,6,3,5,3,7,2,5,3,5,10,2,6,1, %T A205387 1,3,1,6,7,4,2,5,14,6,3,3,5,5,1,4 %N A205387 The index j<k such that n divides s(k)-s(j) for some j, where s(j)=(1/2)C(2j,j). %C A205387 For a guide to related sequences, see A204892. %t A205387 (See the program at A205386.) %Y A205387 Cf. A205386, A204892. %K A205387 nonn %O A205387 1,4 %A A205387 _Clark Kimberling_, Jan 27 2012