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 A292330 #9 Aug 26 2021 09:48:00 %S A292330 1,5,205,168305,2084645,37217545,1711493545,2483072545,2763736405, %T A292330 8866165745,30555604445,55328770405,169592124685,378465215105, %U A292330 423977184745,2038602559445,3815777985545,7279122076645,25250364710105,28104435502445,45424920502505,55625535217765,90160039460905 %N A292330 Numbers k such that k^2 divides 4^k + 1. %Y A292330 Cf. A052539. Subsequence of A015950. %Y A292330 Cf. A127104, A128678. %K A292330 nonn %O A292330 1,2 %A A292330 _Max Alekseyev_, Sep 14 2017