A191284 Increasing sequence generated by these rules: a(1)=1, and if x is in a then floor(3x/2) and 2x are in a.

1, 2, 3, 4, 6, 8, 9, 12, 13, 16, 18, 19, 24, 26, 27, 28, 32, 36, 38, 39, 40, 42, 48, 52, 54, 56, 57, 58, 60, 63, 64, 72, 76, 78, 80, 81, 84, 85, 87, 90, 94, 96, 104, 108, 112, 114, 116, 117, 120, 121, 126, 127, 128, 130, 135, 141, 144, 152, 156, 160, 162, 168, 170, 171, 174, 175, 180, 181, 188, 189, 190, 192, 195, 202, 208, 211, 216

Offset

1,2

Comments

See A191203.

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Example

1 -> 2,3 -> 4,6 -> 8,9,12 ->

Mathematica

g=16; Union[Flatten[NestList[{Floor[3 #/2], 2#} &, 1, g]]]
(* A191284; use g>15 to get all of first 60 terms *)

Crossrefs

Cf. A191203.

Sequence in context: A206716 A010385 A095037 * A071403 A010407 A035240

Adjacent sequences: A191281 A191282 A191283 * A191285 A191286 A191287

Keyword

nonn

Author

Clark Kimberling, May 29 2011

Status

approved