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 A090389 #2 Jan 09 2009 03:00:00 %S A090389 2,11,29,47,83,101,137,173,191,227,263,281,317,353,389,443,461,479, %T A090389 569,587,641,659,677,821,839,857,911,929,947,983,1019,1091,1109,1163, %U A090389 1181,1217,1289 %N A090389 Duplicate of A061238. %K A090389 dead %O A090389 1,1