A287001 Positions of 2 in A286998.

4, 10, 17, 21, 28, 34, 41, 47, 54, 58, 65, 71, 78, 85, 91, 98, 102, 109, 115, 122, 126, 133, 139, 146, 153, 159, 166, 170, 177, 183, 190, 196, 203, 207, 214, 220, 227, 234, 240, 247, 251, 258, 264, 271, 277, 284, 288, 295, 301, 308, 315, 321, 328, 332, 339

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. A286998, A286999, A287000.

Programs

Mathematica

s = Nest[Flatten[# /. {0 -> {1, 0}, 1 -> {2, 0}, 2 -> 0}] &, {0}, 9] (* A286998 *)
Flatten[Position[s, 0]] (* A286999 *)
Flatten[Position[s, 1]] (* A287000 *)
Flatten[Position[s, 2]] (* A287001 *)