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 A129219 #10 Feb 16 2025 08:33:05 %S A129219 4,14,67,42,111,0 %N A129219 Residues of the Lucas - Lehmer primality test for M(7) = 127. %C A129219 Since a(5) = 0, M(7) is prime. %H A129219 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Lucas-LehmerTest.html">Lucas Lehmer Test</a>. %H A129219 Wikipedia, <a href="https://en.wikipedia.org/wiki/Lucas-Lehmer_primality_test">Lucas Lehmer Primality Test</a>. %F A129219 a(0) = 4, a(n) = a(n-1)^2 mod 2^p-1. Last term: a(p-2). %e A129219 a(5)= 111^2 - 2 mod 127 = 0 %Y A129219 Cf. A095847, A003010, A129220, A129221, A129222, A129223, A129224, A129225, A129226. %K A129219 fini,full,nonn %O A129219 0,1 %A A129219 _Sergio Pimentel_, Apr 04 2007