A017959 Powers of sqrt(18) rounded to nearest integer.

1, 4, 18, 76, 324, 1375, 5832, 24743, 104976, 445375, 1889568, 8016758, 34012224, 144301645, 612220032, 2597429617, 11019960576, 46753733110, 198359290368, 841567195983, 3570467226624, 15148209527701

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

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

Crossrefs

Cf. A010474, A001027 (bisection).

Programs

Magma

[Round(Sqrt(18)^n): n in [0..30]]; // Vincenzo Librandi, Nov 20 2011

Maple

Digits:=1500: A017959:=n->round(sqrt(18)^n): seq(A017959(n), n=0..30); # Wesley Ivan Hurt, Apr 18 2017

Mathematica

Floor[(Sqrt[18])^Range[0,25]+1/2] (* Vincenzo Librandi, Nov 20 2011 *)

PARI

a(n)=round(sqrt(18)^n) \\ Charles R Greathouse IV, Nov 18 2011