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 A226913 #14 Dec 02 2013 13:05:06
%S A226913 6,9,10,11,14,15,17,20,23,24,25,28,30,31,34,35,36,37,41,42,43,46,47,
%T A226913 48,50,51,55,58,59,60,62,64,66,67,68,69,72,73,74,75,78,80,82,84,85,87,
%U A226913 88,89,90,91,93,94,98,99,100,101,104,105,106,107,108,109,110,111,114,115,117,118,120,122,123,124
%N A226913 Not of form sum_{i=0..n-1} (-1)^i prime(n-i), where prime(k) denotes the k-th prime.
%C A226913 Complement of A008347.
%H A226913 Robert G. Wilson v, <a href="/A226913/b226913.txt">Table of n, a(n) for n = 1..10140</a>
%K A226913 nonn
%O A226913 1,1
%A A226913 _Ralf Stephan_, Sep 01 2013