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 A129223 #10 Feb 16 2025 08:33:05 %S A129223 4,14,194,37634,218767,510066,386344,323156,218526,504140,103469, %T A129223 417706,307417,382989,275842,85226,523263,0 %N A129223 Residues of the Lucas - Lehmer primality test for M(19) = 524287. %C A129223 Since a(17) = 0, M(19) = 524287 is prime. %H A129223 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Lucas-LehmerTest.html">Lucas Lehmer Test</a>. %H A129223 Wikipedia, <a href="https://en.wikipedia.org/wiki/Lucas-Lehmer_primality_test">Lucas Lehmer Primality Test</a>. %F A129223 a(0) = 4, a(n) = a(n-1)^2 mod 2^p-1. Last term: a(p-2). %e A129223 a(17) = 523263^2 - 2 mod 524287 = 0. %Y A129223 Cf. A095847, A003010, A129219, A129220, A129221, A129222, A129224, A129225, A129226, A001348. %K A129223 fini,full,nonn %O A129223 0,1 %A A129223 _Sergio Pimentel_, Apr 04 2007