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 A014539 #5 Jun 12 2004 03:00:00 %S A014539 5,13,17,21,29,37,41,53,57,61,69,73,77 %N A014539 Erroneous version of A003656. %K A014539 dead %O A014539 0,1