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 A026455 #10 Jul 13 2025 14:38:57
%S A026455 2,3,5,6,7,9,11,14,15,17,18,21,22,23,24,27,29,30,35,36,37,38,39,41,45,
%T A026455 47,48,50,51,54,55,57,59,60,62,63,65,66,69,71,77,78,81,84,86,87,89,90,
%U A026455 91,93,95,99,101,102,104,105,107,110,111,114
%N A026455 a(n) = least positive integer < a(n-1) and not a(i)*a(j)-2 for 1<=i<j<=n.
%C A026455 Appears to be A026453 shifted once left. - _R. J. Mathar_, Jul 13 2025
%H A026455 Ivan Neretin, <a href="/A026455/b026455.txt">Table of n, a(n) for n = 1..1000</a>
%t A026455 a = {2, 3}; 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 A026455 Cf. A026453 and references therein.
%K A026455 nonn
%O A026455 1,1
%A A026455 _Clark Kimberling_