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 A171689 #3 Mar 30 2012 18:52:38 %S A171689 1,8,10,14,16,20,22,24,28,32,36,38,40,44,46,48,52,54,58,62,66,68,70, %T A171689 74,78,80,82,84,88,90,96,98,100,104,106,110,112,114,126,128,130,132, %U A171689 136,140,148,152,156,158,162,164,166,168,172,174,178,182,190,194,196,200 %N A171689 Nonprimes n such that either n+-1 is prime. %C A171689 Essentially the same as A100317. %K A171689 nonn,easy,less %O A171689 1,2 %A A171689 _Juri-Stepan Gerasimov_, Dec 15 2009 %E A171689 Comment from _Charles R Greathouse IV_, Mar 25 2010