A325601 Positions of 2 in A325599.

4, 6, 8, 12, 15, 19, 22, 26, 29, 31, 33, 37, 40, 42, 46, 49, 51, 53, 57, 60, 62, 66, 69, 71, 73, 77, 80, 82, 86, 89, 93, 96, 100, 103, 105, 107, 111, 114, 116, 120, 123, 127, 130, 132, 134, 138, 141, 143, 147, 150, 154, 157, 161, 164, 166, 168, 172, 175, 177

Offset: 1

Author

Clark Kimberling, May 11 2019

Keywords

• nonn
• easy

Comments

All the terms of A325599 are in {1,2}, so that A325600 and A325601 are a complementary pair.

Links

• Clark Kimberling, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A325597, A325599, A325600.

Programs

Mathematica

mex[list_, start_] := (NestWhile[# + 1 &, start, MemberQ[list, #] &]); a = {1}; Do[AppendTo[a, mex[Rest[2 a] + Most[a], Last[a] + 1]], {60}]; a  (* A325597 *)
c = Complement[Range[Last[a]], a]  (* A325598 *)
da = Differences[a] (* A325599 *)
Flatten[Position[da, 1]]  (* A325600 *)
Flatten[Position[da, 2]]  (* A325601 *)
(* Peter J. C. Moses, May 07 2019 *)