A017930 Powers of sqrt(8) rounded up.

1, 3, 8, 23, 64, 182, 512, 1449, 4096, 11586, 32768, 92682, 262144, 741456, 2097152, 5931642, 16777216, 47453133, 134217728, 379625063, 1073741824, 3037000500, 8589934592, 24296004000, 68719476736

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Formula

a(n) = A017912(3n). - R. J. Mathar, Apr 28 2008

Mathematica

Ceiling[(Sqrt[8])^Range[0, 40]] (* Vincenzo Librandi, Nov 21 2011 *)

Prog

(Magma) [Ceiling(Sqrt(8^n)): n in [0..30]]; // Vincenzo Librandi, Nov 21 2011
(PARI) a(n)=ceil(sqrt(8)^n) \\ Charles R Greathouse IV, Nov 21 2011

Crossrefs

Sequence in context: A316980 A331321 A017929 * A305561 A379530 A014398

Adjacent sequences: A017927 A017928 A017929 * A017931 A017932 A017933

Keyword

nonn

Author

N. J. A. Sloane

Status

approved