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 A040103 #3 May 11 2007 03:00:00 %S A040103 2,3,7,11,17,19,23,31,41,43,47,59,67,71,73,79,83,89,97,103,107,113,127 %N A040103 Duplicate of A045323. %K A040103 dead %O A040103 0,1