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A191114 Increasing sequence generated by these rules:  a(1)=1, and if x is in a then 3x-2 and 4x-1 are in a. 4
1, 3, 7, 11, 19, 27, 31, 43, 55, 75, 79, 91, 107, 123, 127, 163, 171, 219, 223, 235, 271, 299, 315, 319, 363, 367, 379, 427, 487, 491, 507, 511, 651, 655, 667, 683, 703, 811, 875, 891, 895, 939, 943, 955, 1083, 1087, 1099, 1135, 1195, 1259, 1275, 1279, 1451, 1459, 1467, 1471, 1515, 1519, 1531, 1707, 1947, 1951, 1963, 1999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A191113.

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

h = 3; i = -2; j = 4; k = -1; f = 1; g = 8;

a = Union[Flatten[NestList[{h # + i, j # + k} &, f, g]]]  (* A191114 *)

b = (a + 2)/3; c = (a + 1)/4; r = Range[1, 1200];

d = Intersection[b, r] (* A191121 *)

e = Intersection[c, r] (* A191152 *)

m = (a + 1)/2  (* divisibility property *)

p = (a + 1)/4  (* divisibility property *)

PROG

(Haskell)

import Data.Set (singleton, deleteFindMin, insert)

a191114 n = a191114_list !! (n-1)

a191114_list = 1 : f (singleton 3)

   where f s = m : (f $ insert (3*m-2) $ insert (4*m-1) s')

             where (m, s') = deleteFindMin s

-- Reinhard Zumkeller, Jun 01 2011

CROSSREFS

Cf. A191113.

Sequence in context: A236632 A098379 A049754 * A181497 A292095 A265323

Adjacent sequences:  A191111 A191112 A191113 * A191115 A191116 A191117

KEYWORD

nonn

AUTHOR

Clark Kimberling, May 27 2011

STATUS

approved

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Last modified December 11 21:00 EST 2019. Contains 329937 sequences. (Running on oeis4.)