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 A026461 #8 Mar 06 2016 11:00:37
%S A026461 2,3,5,6,9,11,12,14,15,17,18,19,21,24,27,29,30,33,35,37,38,39,41,42,
%T A026461 44,45,47,48,50,51,54,57,59,60,62,63,65,66,67,69,71,75,77,78,81,84,87,
%U A026461 89,90,91,95,96,99,101,102,104,105,107,108,110
%N A026461 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-2 for 1<=i<=j<=n.
%H A026461 Ivan Neretin, <a href="/A026461/b026461.txt">Table of n, a(n) for n = 1..1000</a>
%t A026461 a = {2, 3}; 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 A026461 Cf. A026453 and references therein.
%K A026461 nonn
%O A026461 1,1
%A A026461 _Clark Kimberling_