A287414 Positions of 2 in A287411.

3, 5, 8, 11, 14, 18, 21, 23, 26, 29, 32, 36, 39, 41, 44, 48, 50, 53, 57, 59, 62, 66, 68, 71, 74, 77, 81, 83, 86, 90, 93, 95, 98, 102, 104, 107, 111, 113, 116, 120, 122, 125, 128, 131, 135, 138, 140, 143, 146, 149, 153, 156, 158, 161, 165, 167, 170, 173, 176

Offset: 1

Author

Clark Kimberling, May 25 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 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, with 0 in positions given by A287412.

Links

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

Crossrefs

Cf. A287411, A287412, A287413.

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*)