A017930 - OEIS

%I #15 Sep 08 2022 08:44:43

%S 1,3,8,23,64,182,512,1449,4096,11586,32768,92682,262144,741456,

%T 2097152,5931642,16777216,47453133,134217728,379625063,1073741824,

%U 3037000500,8589934592,24296004000,68719476736

%N Powers of sqrt(8) rounded up.

%H Vincenzo Librandi, <a href="/A017930/b017930.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A017912(3n). - _R. J. Mathar_, Apr 28 2008

%t Ceiling[(Sqrt[8])^Range[0,40]] (* _Vincenzo Librandi_, Nov 21 2011 *)

%o (Magma) [Ceiling(Sqrt(8^n)): n in [0..30]]; // _Vincenzo Librandi_, Nov 21 2011

%o (PARI) a(n)=ceil(sqrt(8)^n) \\ _Charles R Greathouse IV_, Nov 21 2011

%K nonn

%O 0,2

%A _N. J. A. Sloane_