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 A325530 #8 May 07 2019 21:29:45
%S A325530 2,1,2,3,1,2,1,1,1,1,2,2,1,1,2,4,2,2,1,1,2,1,3,2,3,1,2,1,1,1,1,2,2,1,
%T A325530 1,2,1,3,2,2,1,1,2,2,1,1,1,1,2,1,1,2,1,1,1,1,2,2,1,1,2,4,2,2,1,1,2,1,
%U A325530 3,2,2,1,1,2,2,1,1,2,2,1,1,2,1,3,2,2
%N A325530 Difference sequence of A325440.
%C A325530 See A325417 for a guide to related sequences. Conjecture: every term is in {1,2,3,4}.
%H A325530 Clark Kimberling, <a href="/A325530/b325530.txt">Table of n, a(n) for n = 1..10000</a>
%t A325530 a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1, Apply[Or,
%t A325530 Map[MemberQ[a, #] &, Select[Flatten[{(#+1)/2, (#+1)/3}],
%t A325530 IntegerQ]]] &]], {20000}]; a; (* A315440 *)
%t A325530 c = Complement[Range[Last[a]], a] ; (* A325441 *)
%t A325530 Differences[a] (* A325530 *)
%t A325530 Differences[c] (* A325531 *)
%t A325530 (* _Peter J. C. Moses_, Apr 23 2019 *)
%Y A325530 Cf. A325417, A325440, A325531.
%K A325530 nonn,easy
%O A325530 1,1
%A A325530 _Clark Kimberling_, May 07 2019