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 A259311 #14 Jul 28 2015 05:54:02 %S A259311 1,2,6,6,6,6,2,10,6,6,6,2,10,2,10,18,6,6,18,6,2,10,2,6,10,6,6,2,10,6, %T A259311 30,6,6,2,10,6,6,6,2,10,2,10,18,6,14,6,10,6,14,6,10,26,10,2,10,2,10, %U A259311 18,42,18,2,18,6,10,6,6,2,6,10,6,6,2,6,10 %N A259311 First differences of A098058. %C A259311 No term is divisible by 4, see comments in A098058. %F A259311 a(n) = A098058(n+1)-A098058(n). %o A259311 (PARI) lista(n) = for(x=1, n, z=(prime(x+1)-prime(x)); if(z%4, print1(z, ", "))) \\ _Michel Marcus_, Jun 24 2015 %Y A259311 Cf. A098058. %K A259311 nonn %O A259311 1,2 %A A259311 _Zak Seidov_, Jun 24 2015