A287445 Positions of 1 in A287443.

2, 6, 9, 12, 14, 18, 20, 24, 27, 29, 33, 36, 38, 42, 45, 48, 50, 54, 56, 60, 63, 65, 69, 72, 75, 77, 81, 83, 87, 90, 92, 96, 99, 102, 104, 108, 110, 114, 117, 120, 122, 126, 128, 132, 135, 137, 141, 144, 146, 150, 153, 156, 158, 162, 164, 168, 171, 174, 176

Offset: 1

Author

Clark Kimberling, May 26 2017

Keywords

• nonn
• easy

Comments

a(n) - a(n-1) is in {2, 3, 4} for n >= 1; also, 3n - a(n) is in {0, 1} for n >= 1. The first 20 numbers 3n - a(n) are 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, with 1 in positions given by A287444.

Links

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

Crossrefs

Cf. A287443, A287444, A287446.

Programs

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 0, 1}, 2->{0, 2, 1}}] &, {0}, 9]; (*A287443*)
Flatten[Position[s, 0]]; (*A287444*)
Flatten[Position[s, 1]]; (*A287445*)
Flatten[Position[s, 2]]; (*A287446*)