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 A046140 #4 May 11 2007 03:00:00 %S A046140 5,7,11,17,31,41,47,61,67,97,101,151,167,227,251,257,271,347,367,557, %T A046140 587 %N A046140 Duplicate of A023241. %K A046140 dead %O A046140 1,1