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A191283 Increasing sequence generated by these rules:  a(1)=1, and if x is in a then 2x and x(x+1)/2  are in a. 2
1, 2, 3, 4, 6, 8, 10, 12, 16, 20, 21, 24, 32, 36, 40, 42, 48, 55, 64, 72, 78, 80, 84, 96, 110, 128, 136, 144, 156, 160, 168, 192, 210, 220, 231, 256, 272, 288, 300, 312, 320, 336, 384, 420, 440, 462, 512, 528, 544, 576, 600, 624, 640, 666, 672, 768, 820, 840, 880, 903, 924, 1024, 1056, 1088, 1152, 1176, 1200, 1248, 1280, 1332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A191203.

LINKS

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

EXAMPLE

1 -> 2 -> 3,4 -> 6,8,10 ->

MATHEMATICA

g = 12; Union[Flatten[NestList[{2 #, (#^2 + #)/2} &, 1, g]]]

(* A191283; use g>10 to get all of first 60 terms *)

CROSSREFS

Cf. A191203.

Sequence in context: A179971 A067069 A100497 * A200678 A088881 A020697

Adjacent sequences:  A191280 A191281 A191282 * A191284 A191285 A191286

KEYWORD

nonn

AUTHOR

Clark Kimberling, May 29 2011

STATUS

approved

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Last modified October 1 19:29 EDT 2020. Contains 337444 sequences. (Running on oeis4.)