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A190809 Increasing sequence generated by these rules: a(1)=1, and if x is in a then 2x and 3x+2 are in a. 4
1, 2, 4, 5, 8, 10, 14, 16, 17, 20, 26, 28, 32, 34, 40, 44, 50, 52, 53, 56, 62, 64, 68, 80, 86, 88, 98, 100, 104, 106, 112, 122, 124, 128, 134, 136, 152, 158, 160, 161, 170, 172, 176, 188, 194, 196, 200, 206, 208, 212, 224, 242, 244, 248, 256, 260, 266, 268, 272, 296 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
See A190803.
LINKS
MATHEMATICA
h = 2; i = 0; j = 3; k = 2; f = 1; g = 9 ;
a = Union[Flatten[NestList[{h # + i, j # + k} &, f, g]]] (* A190809 *)
b = a/2; c = (a - 2)/3; r = Range[1, 900];
d = Intersection[b, r] (* A190853 *)
e = Intersection[c, r] (* A190854 *)
PROG
(Haskell)
import Data.Set (singleton, deleteFindMin, insert)
a190809 n = a190809_list !! (n-1)
a190809_list = f $ singleton 1
where f s = m : (f $ insert (2*m) $ insert (3*m+2) s')
where (m, s') = deleteFindMin s
-- Reinhard Zumkeller, Jun 01 2011
CROSSREFS
Sequence in context: A018498 A002048 A174989 * A067941 A259711 A182195
KEYWORD
nonn
AUTHOR
Clark Kimberling, May 20 2011
EXTENSIONS
a(51)=224 inserted by Reinhard Zumkeller, Jun 01 2011
STATUS
approved

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Last modified February 25 02:17 EST 2024. Contains 370308 sequences. (Running on oeis4.)