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 A026446 #13 Feb 07 2025 22:20:28
%S A026446 2,4,5,6,7,8,9,11,13,15,17,19,21,23,25,27,29,31,33,35,39,41,43,45,49,
%T A026446 51,53,55,59,61,63,66,69,71,73,75,76,81,82,83,85,89,91,95,96,98,99,
%U A026446 103,105,109,111,113,114,115,123,125,129,130,131
%N A026446 a(n) = least positive integer > a(n-1) and not a(i)*a(j)+2 for 1<=i<j<=n, with initial terms 2,4.
%H A026446 Ivan Neretin, <a href="/A026446/b026446.txt">Table of n, a(n) for n = 1..1000</a>
%t A026446 a = {2, 4}; used = {a[[1]]*a[[2]] + 2}; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; used = Union[used, k*a + 2]; AppendTo[a, k], {n, 3, 60}]; a (* _Ivan Neretin_, Mar 06 2016 *)
%Y A026446 Cf. A026443 and references therein.
%K A026446 nonn
%O A026446 1,1
%A A026446 _Clark Kimberling_
%E A026446 Name clarified by _Robert C. Lyons_, Feb 07 2025