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 A292331 #7 Aug 24 2021 10:15:18 %S A292331 1,3,21,609,903,2667,9429,26187,77343,114681,159663,212541,273441, %T A292331 405447,1197483,1357503,1398747,3325749,4451181,4630227,6099429, %U A292331 6865509,8620941,9139263,11757963,13047447,20277201,26992707,34727007,37088709,38596929,39367587,40563663,51491769,58372629,59280123,63002541,71688687,95430909 %N A292331 Numbers k such that k^2 divides 5^k + 1. %H A292331 Max Alekseyev, <a href="/A292331/b292331.txt">Table of n, a(n) for n = 1..88</a> %Y A292331 Subsequence of A015951. %Y A292331 Cf. A127105, A128679. %K A292331 nonn %O A292331 1,2 %A A292331 _Max Alekseyev_, Sep 14 2017