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 A068230 #4 May 11 2007 03:00:00 %S A068230 5,17,29,41,53,89,101,113,137,149,173,197,233,257,269,281,293,317,353 %N A068230 Duplicate of A040117. %K A068230 dead %O A068230 1,1