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 A072539 #4 May 11 2007 03:00:00 %S A072539 3,5,11,13,17,23,31,43,53,61,67,71,73,79,89,101,103,107,127,139,167 %N A072539 Duplicate of A062391. %K A072539 dead %O A072539 0,1