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 A205681 #5 Mar 30 2012 18:58:11 %S A205681 4,8,4,8,12,4,16,12,8,20,16,12,4,24,16,12,28,24,20,12,8,32,24,20,8,36, %T A205681 28,24,12,4,40,36,32,24,20,12,44,40,36,28,24,16,4,48,40,36,24,16,12, %U A205681 56,52,48,40,36,28,16,12,56,48,44,32,24,20,8,64,60,56,48,44,36 %N A205681 Prime(k)-prime(j), where the pairs (k,j) are given by A205677 and A205678. %C A205681 For a guide to related sequences, see A205558. %e A205681 (See the example at A205677.) %t A205681 (See the program at A205677.) %Y A205681 Cf. A205677, A205558, A205682. %K A205681 nonn %O A205681 1,1 %A A205681 _Clark Kimberling_, Jan 30 2012