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 A026451 #8 Mar 06 2016 05:31:46
%S A026451 2,4,5,7,8,9,11,13,14,15,17,19,21,23,25,26,29,31,33,35,39,41,43,45,49,
%T A026451 50,53,55,56,59,61,63,69,71,73,75,76,81,82,85,89,91,95,96,98,99,103,
%U A026451 104,105,109,110,111,113,115,116,125,129,130
%N A026451 a(n) = least positive integer > a(n-1) and not a(i)*a(j)+2 for i<=1<=j<=n, n >= 2.
%H A026451 Ivan Neretin, <a href="/A026451/b026451.txt">Table of n, a(n) for n = 1..1000</a>
%t A026451 a = {2, 4}; used = {a[[1]]^2 + 2, a[[1]]*a[[2]] + 2, a[[2]]^2 + 2}; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; AppendTo[a, k]; used = Union[used, k*a + 2], {n, 3, 60}]; a (* _Ivan Neretin_, Mar 06 2016 *)
%Y A026451 Cf. A026443 and references therein.
%K A026451 nonn
%O A026451 1,1
%A A026451 _Clark Kimberling_