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 A100904 #17 Feb 22 2024 02:21:41 %S A100904 22,351,1061,410997 %N A100904 Numbers k such that (10^k+1)^2-2 is prime. %H A100904 Steven Harvey, <a href="http://harvey563.tripod.com/Carol_Kynea.txt">Carol and Kynea Primes</a>. %o A100904 (PARI) is(n)=ispseudoprime((10^n+1)^2-2) \\ _Charles R Greathouse IV_, Feb 19 2016 %K A100904 nonn,more %O A100904 1,1 %A A100904 _Ray Chandler_, Nov 21 2004 %E A100904 a(4) from _Ryan Propper_, Feb 21 2024