A287413 Positions of 1 in A287411.

2, 4, 9, 10, 15, 17, 20, 24, 25, 28, 33, 35, 38, 42, 43, 47, 49, 54, 56, 58, 63, 65, 69, 70, 73, 78, 80, 82, 87, 89, 92, 96, 97, 101, 103, 108, 110, 112, 117, 119, 123, 124, 127, 132, 134, 137, 139, 144, 145, 150, 152, 155, 159, 160, 164, 166, 171, 172, 177

Offset: 1

Author

Clark Kimberling, May 25 2017

Keywords

• nonn
• easy

Comments

a(n) - a(n-1) is in {1, 2, 3, 4, 5} for n >= 1; also, 3n - a(n) is in {0, 1, 2} for n >= 1. The first 20 numbers 3n - a(n) are 1, 2, 0, 2, 0, 1, 1, 0, 2, 2, 0, 1, 1, 0, 2, 1, 2, 0, 1, 2, with 0 in positions given by A287414.

Links

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

Crossrefs

Cf. A287411, A287412, A287414.

Programs

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{1, 2, 0}, 2->{0, 2, 1}}] &, {0}, 9]; (*A287411*)
Flatten[Position[s, 0]]; (*A287412*)
Flatten[Position[s, 1]]; (*A287413*)
Flatten[Position[s, 2]]; (*A287414*)