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 A101232 #9 Oct 05 2020 05:07:42 %S A101232 2,139,396733,22439962446379651 %N A101232 First occurrence of prime gap 10^n. %H A101232 Schiffman, <a href="https://primes.utm.edu/curios/page.php/22439962446379651.html">Prime Curios! 22439962446379651</a> %Y A101232 Cf. A000230, A062529. %K A101232 hard,more,nonn %O A101232 0,1 %A A101232 _Lekraj Beedassy_, Dec 16 2004