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 A086807 #2 Jun 12 2004 03:00:00 %S A086807 2,5,13,17,29,37,41,53,61 %N A086807 Erroneous version of A000213. %K A086807 dead %O A086807 1,1