A325495 Difference sequence of A325420.

2, 1, 3, 3, 3, 2, 4, 2, 1, 3, 2, 1, 3, 4, 2, 2, 1, 3, 3, 3, 2, 1, 3, 3, 3, 2, 1, 3, 2, 2, 2, 2, 1, 3, 3, 3, 2, 4, 2, 1, 3, 2, 1, 3, 3, 3, 2, 1, 3, 2, 1, 3, 2, 4, 3, 3, 2, 1, 3, 4, 2, 2, 1, 3, 3, 3, 2, 4, 2, 1, 3, 2, 1, 3, 4, 2, 2, 1, 3, 3, 3, 2, 4, 3, 3, 2

Offset: 1

Author

Clark Kimberling, May 05 2019

Keywords

• nonn
• easy

Comments

See A325417 for a guide to related sequences. Conjecture: every term is in {1,2,3,4}.

Crossrefs

Cf. A325417, A325494.

Programs

Mathematica

a = {1}; Do[AppendTo[a, NestWhile[# + 1 &, Last[a] + 1,
Apply[Or, Map[MemberQ[a, #] &, Select[Flatten[{#/3, (# - 1)/2}],
IntegerQ]]] &]], {2000}]; a ;       (* A325419 *)
c = Complement[Range[Last[a]], a] ; (* A325420 *)
Differences[a]  (* A325494 *)
Differences[c]  (* A325495 *)
(* Peter J. C. Moses, Apr 23 2019 *)