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 A167909 #4 Mar 30 2012 18:52:35 %S A167909 2,2,6,6,5,7,7,5,5,6,7,7,5,7,4,6,8,5,6,5,14,4,7,12,7,6,4,6,7,12,6,13, %T A167909 12,5,5,7,11,6,6,7,7,5,11,14,5,5,14,6,11,5,6,8,6,6,4,6,8,4,8,11,12,7, %U A167909 4,6,8,5,5,12,8,4,8,4,6,13,19,6,10,6,7,7,10,6,7,7,6,5,13,11,5,6,7,13,4,6,8,10 %N A167909 Differences between consecutive single (or isolated) numbers A167706. %e A167909 a(1)=4-2=2, a(2)=6-4=2, a(3)=12-6=6. %Y A167909 Cf. A167706. %K A167909 nonn %O A167909 1,1 %A A167909 _Juri-Stepan Gerasimov_, Nov 15 2009 %E A167909 Corrected at 3 or more placed by _R. J. Mathar_, May 30 2010