A287573 Positions of 1 in A287571.

3, 8, 10, 13, 17, 23, 28, 30, 36, 38, 41, 47, 50, 53, 59, 64, 66, 69, 75, 80, 83, 88, 90, 93, 97, 103, 108, 110, 116, 118, 121, 127, 129, 135, 140, 142, 148, 150, 153, 159, 162, 165, 171, 176, 179, 184, 186, 189, 196, 198, 201, 207, 210, 213, 219, 224, 227

Offset: 1

Author

Clark Kimberling, Jun 01 2017

Keywords

• nonn
• easy

Comments

a(n) - a(n-1) is in {1,2,3,4,5,6,7} for n >= 1; also, 4n - a(n) is in {0,1,2,3} for n >= 1. The first 20 numbers 4n - a(n) are 1, 0, 2, 3, 3, 1, 0, 2, 0, 2, 3, 1, 2, 3, 1, 0, 2, 3, 1, 0, with

0 in positions given by A287575,

1 in positions given by A287572,

2 in positions given by A287573,

3 in positions given by A287574.

Links

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

Crossrefs

Cf. A287571, A287572, A287574, A287575.

Programs

Mathematica

s = Nest[Flatten[# /. {0 -> {0,3,1,2}, 1 -> {3,1,2,0}, 2 -> {1,2,0,3}, 3 -> {2,0,3,1}}] &, {0}, 9]; (* A287571 *)
Flatten[Position[s, 0]]; (* A287572 *)
Flatten[Position[s, 1]]; (* A287573 *)
Flatten[Position[s, 2]]; (* A287574 *)
Flatten[Position[s, 3]]; (* A287575 *)