A287570 Positions of 3 in A287566.

3, 5, 12, 14, 20, 22, 27, 29, 34, 39, 41, 48, 49, 56, 58, 63, 66, 71, 73, 80, 81, 88, 90, 95, 99, 101, 108, 110, 116, 118, 123, 125, 129, 136, 138, 143, 147, 149, 156, 158, 164, 166, 171, 173, 178, 183, 185, 192, 196, 198, 203, 205, 210, 215, 217, 224, 225

Offset: 1

Author

Clark Kimberling, May 31 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, 3, 0, 2, 0, 2, 1, 3, 2, 1, 3, 0, 3, 0, 2, 1, 2, 1, 3, 0, with

0 in positions given by A287570,

1 in positions given by A287567,

2 in positions given by A287568,

3 in positions given by A287569.

Links

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

Crossrefs

Cf. A287566, A287567, A287568, A287569.

Programs

Mathematica

s = Nest[Flatten[# /. {0 -> {0, 2, 3, 1}, 1 -> {2, 3, 2, 0}, 2 -> {3, 1, 0, 2}, 3 -> {1, 0, 2, 3}}] &, {0}, 9];   (* A287566 *)
Flatten[Position[s, 0]]; (* A287567 *)
Flatten[Position[s, 1]]; (* A287568 *)
Flatten[Position[s, 2]]; (* A287569 *)
Flatten[Position[s, 3]]; (* A287570 *)