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 A204995 #8 Mar 30 2012 18:58:09 %S A204995 1,1,1,1,2,2,3,1,4,4,5,2,6,6,1,3,8,3,9,4,2,10,11,1,5,12,3,6,14,2,15,2, %T A204995 4,16,1,3,18,18,5,3,20,4,21,10,2,22,23,1,7,5,7,12,26,6,3,5,8,28,29,2 %N A204995 The index j<k such that n divides k^2-j^2, where k is the least index (A204905) for which such j exists. %C A204995 For a guide to related sequences, see A204892. %t A204995 (See the program at A204994.) %Y A204995 Cf. A204892, A204994. %K A204995 nonn %O A204995 1,5 %A A204995 _Clark Kimberling_, Jan 21 2012