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 A167921 #4 Mar 30 2012 18:52:35 %S A167921 1,3,5,11,17,22,29,36,41,46,52,59,66,71,78,82,88,96,101,107,112,126, %T A167921 130,137,149,156,162,166,172,179,191,197,210,222,227,232,239,250,256, %U A167921 262,269,276,281,292,306,311,316,330,336,347,352,358,366,372,378,382,388 %N A167921 Single or isolated numbers-1. %Y A167921 Cf. A167706. %K A167921 nonn %O A167921 1,2 %A A167921 _Juri-Stepan Gerasimov_, Nov 15 2009 %E A167921 Corrected (96 inserted) by _R. J. Mathar_, May 30 2010