A287453 Positions of 1 in A287451.

2, 6, 7, 10, 14, 18, 21, 22, 26, 30, 31, 35, 38, 42, 43, 46, 50, 54, 55, 59, 63, 66, 67, 71, 74, 78, 79, 82, 86, 90, 93, 94, 98, 101, 105, 106, 110, 114, 115, 118, 122, 126, 129, 130, 134, 138, 139, 143, 146, 150, 151, 154, 158, 162, 165, 166, 170, 173, 177

Offset: 1

Author

Clark Kimberling, May 30 2017

Keywords

• nonn
• easy

Comments

a(n) - a(n-1) is in {1, 3, 4} for n >= 1; also, 3n - a(n) is in {0, 1, 2} for n >= 1. The first 20 numbers 3n - a(n) are 1, 0, 2, 2, 1, 0, 0, 2, 1, 0, 2, 1, 1, 0, 2, 2, 1, 0, 2, 1, with 0 in positions given by A287453, 1 in positions given by A287452, and 2 in positions given by A287454.

Links

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

Crossrefs

Cf. A287451, A287452, A287454.

Programs

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 0, 1}, 2->{1, 2, 0}}] &, {0}, 9]; (*A287451*)
Flatten[Position[s, 0]]; (*A287452*)
Flatten[Position[s, 1]]; (*A287453*)
Flatten[Position[s, 2]]; (*A287454*)