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 A227247 #15 Jul 07 2023 11:14:26 %S A227247 2,1433,3257,4999,9769,12409 %N A227247 Prime factors of 10^(10^100) - 2. %C A227247 Is this sequence the same as "Primes p such that 10^p - 1 divides 10^(10^(10^100)) - 100"? %H A227247 Dario A. Alpern, <a href="https://www.alpertron.com.ar/GOOGOLPM.HTM">Factors of 1000 numbers up to googolplexplex</a> %H A227247 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Googolplex.html">Googolplex</a> %K A227247 nonn,fini,hard,more %O A227247 1,1 %A A227247 _Arkadiusz Wesolowski_, Nov 04 2013