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 A024767 #5 Mar 30 2012 18:35:23 %S A024767 2,3,5,23,25,32,52,56,254,256,322,326,524,566,2564,3262,5246,5662, %T A024767 25642 %N A024767 Every prefix prime in base 7 (written in base 7). %K A024767 nonn,base,fini,full %O A024767 1,1 %A A024767 _David W. Wilson_