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 A050234 #9 Feb 16 2025 08:32:40 %S A050234 23,4567891,23456789,1234567891,23456789123456789, %T A050234 23456789123456789123,4567891234567891234567891, %U A050234 1234567891234567891234567891,7891234567891234567891234567891 %N A050234 Primes in A007923. %H A050234 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SmarandacheSequences.html">Smarandache Sequences.</a> %H A050234 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/SmDecon.txt">Smarandache Deconstructive Sequence</a>. %K A050234 nonn %O A050234 1,1 %A A050234 _Eric W. Weisstein_