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 A073104 #6 Nov 10 2007 03:00:00 %S A073104 1523,1447,1373,1301,1231,1163,1097,1033,971,911,853,797,743,691,641 %N A073104 Duplicate of A060566. %K A073104 dead %O A073104 1,1