OFFSET
0,2
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
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