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 A167911 #8 Oct 09 2024 06:17:51 %S A167911 1,2,2,2,1,1,1,1,2,1,1,1,1,2,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,2, %T A167911 1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,2,1,1,1,1,1,2,1,1,2, %U A167911 1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1 %N A167911 Differences between consecutive non-single (or nonisolated) numbers A167707. %F A167911 a(n) = A167707(n+1) - A167707(n). - _Jason Yuen_, Oct 08 2024 %e A167911 a(1)=1-0=1, a(2)=3-1=2, a(3)=5-3=2, a(4)=7-5=2, a(5)=8-7=1. %Y A167911 Cf. A167707. %K A167911 nonn %O A167911 1,2 %A A167911 _Juri-Stepan Gerasimov_, Nov 15 2009 %E A167911 Entries checked by _R. J. Mathar_, May 30 2010