A051147 Smallest m such that A051145(m) = 2^n.

1, 2, 3, 5, 9, 12, 17, 29, 45, 81, 105, 177, 245, 323, 569, 893, 1277, 2121, 3221, 4853, 7697, 11015, 15333, 25841, 40157, 59213, 84239, 135107, 184679, 265277, 445029, 606509, 830411, 1394489, 1973405, 2683997, 4176989, 6710687, 9906153, 15114275, 22269021

Offset

0,2

Links

Table of n, a(n) for n=0..40.

Formula

A051145(a(n)) = 2^n. - Reinhard Zumkeller, Jul 05 2014

Mathematica

Block[{a, b, s}, a[0] = 0; a[1] = 1; a[n_] := a[n] = (b = 0; While[b++; BitOr[b, a[n - 1]] <= BitOr[a[n - 2], a[n - 1]]]; b); s = Array[a, 2^10, 0]; Array[FirstPosition[s, 2^#][[1]] - 1 &, Floor@ Log2@ Max@ s + 1, 0]] (* Michael De Vlieger, Aug 25 2021, after Jean-François Alcover at A051145 *)

Prog

(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a051147 = fromJust . (`elemIndex` a051145_list) . (2 ^)
-- Reinhard Zumkeller, Jul 05 2014

Crossrefs

Cf. A000079, A051145, subsequence of A244747.

Sequence in context: A099420 A184794 A144728 * A316154 A079741 A000861

Adjacent sequences: A051144 A051145 A051146 * A051148 A051149 A051150

Keyword

nonn,easy,nice

Author

N. J. A. Sloane, E. M. Rains

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Oct 03 2000

a(21)-a(23) from Reinhard Zumkeller, Jul 05 2014

Definition corrected by Reinhard Zumkeller, Jul 05 2014

a(24)-a(30) from Charlie Neder, Oct 12 2018

More terms from Sean A. Irvine, Aug 25 2021

Status

approved