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 A025044 #12 Jun 30 2017 20:15:27
%S A025044 0,1,8,14,20,24,25,26,32,38,44,50,56,62,68,74,80,86,90,92,94,98,104,
%T A025044 110,116,118,120,122,128,134,140,144,146,152,158,160,164,170,176,182,
%U A025044 184,188,194,200,206,212,218,220,224,230,234,236,242,248,254,260,264,266,272,274
%N A025044 a(n) not of form prime - a(k), k < n.
%H A025044 Ray Chandler, <a href="/A025044/b025044.txt">Table of n, a(n) for n = 1..10000</a>
%t A025044 a1 = {0}; nmax = 275; Do[ If[Select[n + a1, PrimeQ] == {}, AppendTo[a1, n]] , {n, nmax}]; a1 (* _Ray Chandler_, Jan 15 2017 *)
%Y A025044 Cf. A025043, A068638, A072545, A254337.
%K A025044 nonn
%O A025044 1,3
%A A025044 _David W. Wilson_