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

Author

N. J. A. Sloane

Keywords

• nonn

Links

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

Programs

Magma

[Ceiling(Sqrt(8^n)): n in [0..30]]; // Vincenzo Librandi, Nov 21 2011

Mathematica

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

PARI

a(n)=ceil(sqrt(8)^n) \\ Charles R Greathouse IV, Nov 21 2011

Formula

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