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 A026436 #17 Jun 24 2025 13:26:06
%S A026436 3,4,5,6,7,8,9,10,12,13,15,16,18,21,22,24,25,28,30,32,33,36,37,40,42,
%T A026436 43,45,46,48,50,52,54,56,57,58,60,61,66,67,68,70,72,73,75,76,78,80,81,
%U A026436 82,84,85,86,88,91,92,93,94,96,97,100
%N A026436 a(n) = least positive integer > a(n-1) and not a(i)*a(j)-1 for 1<=i<j<=n, with initial terms 3,4.
%C A026436 Appears to be A026432 shifted left. - _R. J. Mathar_, Jun 24 2025
%H A026436 Ivan Neretin, <a href="/A026436/b026436.txt">Table of n, a(n) for n = 1..1000</a>
%t A026436 a = {3, 4}; used = {a[[1]]*a[[2]] - 1}; Do[k = a[[-1]] + 1; While[MemberQ[used, k], k++]; used = Union[used, k*a - 1]; AppendTo[a, k], {n, 3, 60}]; a (* _Ivan Neretin_, Mar 07 2016 *)
%Y A026436 Cf. A026431 and references therein.
%K A026436 nonn
%O A026436 1,1
%A A026436 _Clark Kimberling_
%E A026436 Name clarified by _Robert C. Lyons_, Feb 06 2025