A287374 Positions of 1 in A101666.

2, 3, 5, 7, 9, 11, 13, 16, 17, 19, 21, 24, 25, 27, 30, 31, 33, 35, 37, 40, 41, 43, 46, 47, 49, 51, 53, 56, 58, 59, 61, 63, 65, 67, 69, 72, 73, 75, 78, 79, 81, 83, 85, 88, 90, 91, 93, 95, 97, 99, 101, 104, 105, 107, 110, 111, 114, 115, 117, 119, 121, 123, 125

Offset

1,1

Comments

2n - a(n) is in {0,1} for n >= 1. The first 20 numbers 2n - a(n) are 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, with 0 is positions given by A287373.

Links

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

Formula

a(n) = (1/2)*A287375(n) for n >= 1.

Mathematica

s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {1, 2}, 2 -> {1, 0}}] &, {0}, 12] (* A101666 *)
Flatten[Position[s, 0]]  (* A287373 *)
Flatten[Position[s, 1]]  (* A287374 *)
Flatten[Position[s, 2]]  (* A287375 *)

Crossrefs

Cf. A287372, A287373, A287375.

Sequence in context: A360107 A096149 A033055 * A186390 A022554 A097046

Adjacent sequences: A287371 A287372 A287373 * A287375 A287376 A287377

Keyword

nonn,easy

Author

Clark Kimberling, May 25 2017

Status

approved