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 A325426 #6 Apr 28 2019 20:14:15
%S A325426 2,4,6,7,10,12,13,16,18,21,22,25,28,30,34,36,38,39,40,43,46,48,49,52,
%T A325426 54,55,58,61,62,63,64,66,67,70,74,75,76,79,82,84,85,88,90,94,97,100,
%U A325426 102,103,106,108,109,112,114,115,117,118,120,121,124,129,130
%N A325426 Complement of A325425.
%C A325426 These are the numbers 2x and floor(3x/2) as x ranges through the numbers x > 1 in A325425.
%H A325426 Clark Kimberling, <a href="/A325426/b325426.txt">Table of n, a(n) for n = 1..10000</a>
%t A325426 a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1, Apply[Or,
%t A325426 Map[MemberQ[a, #] &, Select[Flatten[{#/2,
%t A325426 If[Mod[#, 3] == 0, (2 #)/3, 0] + If[Mod[#, 3] == 1, 1/3 (1 + 2 #), 0]}],
%t A325426 IntegerQ || # == 0]]] &]], {150}]; a (* A325425 *)
%t A325426 Complement[Range[Last[a]], a]; (* A325426 *)
%t A325426 (* - _Peter J. C. Moses_, Apr 25 2019 *)
%Y A325426 Cf. A325417, A325425.
%K A325426 nonn,easy
%O A325426 1,1
%A A325426 _Clark Kimberling_, Apr 27 2019