A287526 Positions of 1 in A287524.

2, 4, 9, 10, 14, 18, 21, 23, 25, 28, 32, 36, 38, 40, 45, 48, 50, 52, 57, 59, 61, 65, 67, 72, 73, 77, 81, 82, 86, 90, 92, 94, 99, 102, 104, 106, 110, 112, 117, 118, 122, 126, 129, 131, 133, 138, 140, 142, 146, 148, 153, 154, 158, 162, 165, 167, 169, 173, 175

Offset

1,1

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, 1, 0, 0, 1, 2, 2, 1, 0, 1, 2, 0, 0, 1, 2, 0, 1, with 0 in positions given by A287527, 1 in positions given by A189724, and 2 in positions given by A287524.

Links

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

Mathematica

s = Nest[Flatten[# /. {0->{0, 1, 2}, 1->{1, 0, 2}, 2->{2, 0, 1}}] &, {0}, 9]; (*A287524*)
Flatten[Position[s, 0]]; (*A189724*)
Flatten[Position[s, 1]]; (*A287526*)
Flatten[Position[s, 2]]; (*A189634*)

Crossrefs

Cf. A287524, A189724, A189634.

Sequence in context: A252760 A191766 A287518 * A287413 A026602 A287436

Adjacent sequences: A287523 A287524 A287525 * A287527 A287528 A287529

Keyword

nonn,easy

Author

Clark Kimberling, May 30 2017

Status

approved