A287408 Positions of 0 in A287407.

1, 6, 8, 11, 15, 16, 20, 22, 27, 29, 31, 36, 38, 42, 43, 46, 51, 53, 56, 58, 63, 64, 69, 71, 74, 78, 79, 83, 85, 90, 91, 96, 98, 101, 105, 106, 110, 112, 117, 119, 123, 124, 127, 132, 134, 136, 141, 143, 146, 150, 151, 155, 157, 162, 164, 166, 171, 172, 177

Offset

1,2

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 2, 0, 1, 1, 0, 2, 0, 2, 1, 0, 2, 1, 1, 0, 2, 2, 0, 1, 1, 0, with 0 in positions given by A287403.

Links

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

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{2, 1, 0}, 2->{2, 0, 1}}] &, {0}, 9]; (*A287407*)
Flatten[Position[s, 0]]; (*A287408*)
Flatten[Position[s, 1]]; (*A287409*)
Flatten[Position[s, 2]]; (*A287410*)

Crossrefs

Cf. A287407, A287409, A287410.

Sequence in context: A200722 A120152 A315855 * A287398 A167499 A020716

Adjacent sequences: A287405 A287406 A287407 * A287409 A287410 A287411

Keyword

nonn,easy

Author

Clark Kimberling, May 25 2017

Status

approved