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 A364614 #7 Sep 13 2023 22:50:27
%S A364614 1,3,7,9,13,19,21,27,31,37,39,43,49,57,61,63,67,73,79,81,91,93,97,103,
%T A364614 109,111,117,127,129,133,139,147,151,157,163,169,171,181,183,189,193,
%U A364614 199,201,211,217,219,223,229,237,241,243,247,259,271,273,277,279
%N A364614 Numbers not divisible by any prime of the form 3*k - 1.
%C A364614 The sequence is closed under multiplication.
%t A364614 s = Select[Prime[Range[100]], Mod[#, 3] == 2 &] (* A003627 *)
%t A364614 Select[r = Range[Max[s]], Intersection[#/s, r] == {} &]
%Y A364614 Cf. A003627, A364832.
%Y A364614 A215800 is a subsequence.
%K A364614 nonn
%O A364614 1,2
%A A364614 _Clark Kimberling_, Aug 09 2023