OFFSET
1,1
COMMENTS
These are the numbers 2a(m) + a(m-1) for a(m)=A325597(m), m >= 1 .
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
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 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, May 10 2019
STATUS
approved