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 A227245 #26 Jul 28 2025 17:12:34 %S A227245 1,3,9,11,17,33,41,51,73,99,101,123,137 %N A227245 Numbers k such that 10^k - 1 divides 10^(10^(10^100)) - 10. %H A227245 Dario A. Alpern, <a href="https://www.alpertron.com.ar/glpxm10.pl">Known prime factors of Googolplexplex - 10</a> %H A227245 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Googolplex.html">Googolplex</a> %Y A227245 Cf. A173394, A178070, A200879. %K A227245 nonn,fini %O A227245 1,2 %A A227245 _Arkadiusz Wesolowski_, Nov 02 2013