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 A325531 #8 Jul 13 2019 00:42:31
%S A325531 3,2,1,3,6,2,4,2,1,1,2,2,4,3,1,2,2,1,3,6,2,4,3,1,2,2,4,2,6,4,6,2,4,2,
%T A325531 1,1,2,2,4,3,1,2,2,4,2,4,2,4,3,1,2,2,4,3,1,2,2,1,1,2,4,2,2,4,2,1,1,2,
%U A325531 2,4,3,1,2,2,4,6,2,4,3,1,2,2,4,2,4,2
%N A325531 Difference sequence of A325441.
%C A325531 See A325417 for a guide to related sequences. Conjecture: every term is in {1,2,3,4,6}; note that 5 is missing.
%H A325531 Clark Kimberling, <a href="/A325531/b325531.txt">Table of n, a(n) for n = 1..10000</a>
%t A325531 a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1, Apply[Or,
%t A325531 Map[MemberQ[a, #] &, Select[Flatten[{(#+1)/2, (#+1)/3}],
%t A325531 IntegerQ]]] &]], {20000}]; a; (* A315440 *)
%t A325531 c = Complement[Range[Last[a]], a] ; (* A325441 *)
%t A325531 Differences[a] (* A325530 *)
%t A325531 Differences[c] (* A325531 *)
%t A325531 (* _Peter J. C. Moses_, Apr 23 2019 *)
%Y A325531 Cf. A325417, A325441, A325530.
%K A325531 nonn,easy
%O A325531 1,1
%A A325531 _Clark Kimberling_, May 07 2019