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 A059898 #3 Sep 29 2006 03:00:00 %S A059898 31,43,109,127,157,223,229,277,283,307,397,433,439,457,499,601,643,691 %N A059898 Duplicate of A014752. %K A059898 dead %O A059898 1,1