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 A252504 #16 Oct 11 2020 10:51:52 %S A252504 201467286689315906290,397382840070993192736,591308502828791273105, %T A252504 783964159847056303858,975686344403186930556,1166671149317708576746, %U A252504 1357047080144517060882,1546904858094574427441,1736311930333612544048,1925320391606803968923 %N A252504 Number of primes less than n*10^22. %H A252504 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x), The first 10 values of pi(k*10^22)</a> %K A252504 nonn %O A252504 1,1 %A A252504 _David Baugh_, Mar 21 2015