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 A072889 #3 May 11 2007 03:00:00 %S A072889 1,136,153,244,370,371,407,919,1459 %N A072889 Duplicate of A072884. %K A072889 dead %O A072889 1,2