A013948 Positions of 2's in Kolakoski sequence (A000002).

2, 3, 6, 8, 9, 11, 12, 15, 18, 19, 21, 24, 26, 27, 30, 33, 35, 36, 38, 39, 42, 44, 45, 47, 50, 53, 54, 56, 57, 60, 62, 63, 65, 66, 69, 72, 74, 75, 77, 80, 81, 83, 84, 87, 89, 90, 92, 93, 96, 99, 100, 102, 105, 107, 108, 110, 111, 114, 117, 119, 120, 123, 126, 127, 129, 132, 135

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• easy

Crossrefs

Cf. A000002, A054353, A078649.

Complement: A013947.

Formula

Numbers n such that A078649(A054353(n-1)-n+2)-A054353(n-1)=1. [Benoit Cloitre, Feb 08 2009]

Least k such that A054353(k)>=A078649(n). a(n)=A078649(n)-n+1. [Benoit Cloitre, Feb 07 2009]