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 A069974 #3 May 11 2007 03:00:00 %S A069974 2,2,3,3,5,3,7,5,7,5,11,5,13,7,7,7,17,7,19,7,13,11,23,7,13,13,19,13,29 %N A069974 Duplicate of A039650. %K A069974 dead %O A069974 1,1