A287412 - OEIS

A287412

Positions of 0 in A287411.

1, 6, 7, 12, 13, 16, 19, 22, 27, 30, 31, 34, 37, 40, 45, 46, 51, 52, 55, 60, 61, 64, 67, 72, 75, 76, 79, 84, 85, 88, 91, 94, 99, 100, 105, 106, 109, 114, 115, 118, 121, 126, 129, 130, 133, 136, 141, 142, 147, 148, 151, 154, 157, 162, 163, 168, 169, 174, 175

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

a(n) - a(n-1) is in {1, 3, 5} for n >= 1; also, 3n - a(n) is in {0, 2} for n >= 1. The first 20 numbers 3n - a(n) are 2, 0, 2, 0, 2, 2, 2, 2, 0, 0, 2, 2, 2, 2, 0, 2, 0, 2, 2, 0, with 0 in positions given by A287413.

LINKS

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

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*)

CROSSREFS

Cf. A287411, A287413, A287414.

Sequence in context: A035110 A011990 A105085 * A097354 A171153 A327313

Adjacent sequences: A287409 A287410 A287411 * A287413 A287414 A287415

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 25 2017

STATUS

approved