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 A024765 #5 Mar 30 2012 18:35:23 %S A024765 2,3,21,23,32,34,214,232,324,342,2322,3244,3422,34222 %N A024765 Every prefix prime in base 5 (written in base 5). %K A024765 nonn,base,fini,full %O A024765 1,1 %A A024765 _David W. Wilson_