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 A230376 #35 Apr 14 2022 09:41:43 %S A230376 11,1803647,2699538733,30778903,112663560435723374699,554945667652531, %T A230376 6243610407478181159725577611,67643278270835231300426724641533, %U A230376 253382315888712050791030544452181354268272663,14710826638296122001733445931451 %N A230376 The left Aurifeuillian factor of k^k - 1 for k congruent to 1 (mod 4) and squarefree. %C A230376 The values of k are given by A005117, except for the leading 1. %C A230376 Named after the French mathematician Léon-François-Antoine Aurifeuille (1822-1882). - _Bernard Schott_, Apr 13 2022 %H A230376 Richard P. Brent, <a href="http://arxiv.org/abs/1004.5466">On computing factors of cyclotomic polynomials</a>, arXiv:1004.5466 [math.NT], 2010. %H A230376 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AurifeuilleanFactorization.html">Aurifeuillean Factorization</a>. %H A230376 Wikipedia, <a href="https://en.wikipedia.org/wiki/Léon-François-Antoine_Aurifeuille">Léon-François-Antoine Aurifeuille</a>. %H A230376 Wikipedia, <a href="https://en.wikipedia.org/wiki/Aurifeuillean_factorization">Aurifeuillean factorization</a>. %e A230376 1803647 is in the sequence because it is an Aurifeuillian factor of 13^13-1. %Y A230376 Cf. A005117, A220983, A220984, A230375, A230377, A230378, A230379. %K A230376 nonn %O A230376 1,1 %A A230376 _Colin Barker_, Oct 17 2013