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 A141184 #18 Oct 18 2014 12:55:29 %S A141184 19,31,61,79,109,139,151,181,199,211,229,241,271,331 %N A141184 Duplicate of A033212. %K A141184 dead %O A141184 1,1