A074278 Positions in the Kolakoski sequence A000002 when there are a multiple of 3 1's and the current term is 1.

5, 13, 17, 23, 29, 34, 41, 48, 52, 59, 67, 71, 78, 85, 91, 97, 103, 109, 115, 121, 125, 131, 137, 143, 149, 157, 161, 168, 175, 179, 185, 191, 196, 202, 209, 217, 221, 227, 233, 239, 245, 251, 256, 263, 268, 274, 280, 286, 292, 298, 304, 311, 319, 323, 329

Offset

1,1

Comments

n such that A000002(n) = 1 and A000002(m) = 1 for 3k indices m <= n, for some natural number k.

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

Example

The Kolakoski sequence begins 1,2,2,1,1,2,1,2,2,1,2,2,1,1,2,... At position 5 and position 13, there are 3 and 6 1's, so 5 and 13 are in this sequence.

Crossrefs

Cf. A074273.

Sequence in context: A249034 A208883 A182078 * A087895 A092101 A105596

Adjacent sequences: A074275 A074276 A074277 * A074279 A074280 A074281

Keyword

nonn,easy

Author

Jon Perry, Sep 21 2002

Extensions

Extended and edited by Nathaniel Johnston, May 02 2011

Status

approved