A287111 Positions of 2 in A287108.

4, 7, 9, 14, 16, 20, 27, 30, 32, 36, 43, 45, 52, 57, 60, 62, 67, 69, 73, 80, 82, 89, 94, 97, 99, 103, 110, 115, 118, 120, 127, 130, 132, 137, 139, 143, 150, 153, 155, 159, 166, 168, 175, 180, 183, 185, 189, 196, 201, 204, 206, 213, 216, 218, 223, 225, 229

Offset: 1

Author

Clark Kimberling, May 22 2017

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A287108, A287109, A287110.

Programs

Mathematica

s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {2, 1}, 2 -> 0}] &, {0}, 10] (* A287108 *)
Flatten[Position[s, 0]] (* A287109 *)
Flatten[Position[s, 1]] (* A287110 *)
Flatten[Position[s, 2]] (* A287111 *)