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 A131317 #10 Sep 15 2022 18:09:55 %S A131317 22,33,55,77,111,1111,11111,1111111,11111111111,11111111111111111, %T A131317 2222222222222222222,3333333333333333333,5555555555555555555, %U A131317 7777777777777777777,22222222222222222222222,33333333333333333333333 %N A131317 Incomplete version of A196104. %K A131317 dead %O A131317 1,1