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 A069454 #4 May 11 2007 03:00:00 %S A069454 29,41,59,71,227,239,269,281,311,347,461,521,569,599,617,641,659,857 %N A069454 Duplicate of A035789. %K A069454 dead %O A069454 1,1