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 A086998 #4 May 11 2007 03:00:00 %S A086998 7,11,13,17,19,23,29,47,59,61,73,89,97,101,103,109,113,127,131,137,139 %N A086998 Duplicate of A028416. %K A086998 dead %O A086998 1,1