A017943 Powers of sqrt(13) rounded down.

1, 3, 13, 46, 169, 609, 2197, 7921, 28561, 102978, 371293, 1338715, 4826809, 17403307, 62748517, 226242995, 815730721, 2941158941, 10604499373, 38235066239, 137858491849, 497055861119, 1792160394037, 6461726194556

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..900

Formula

a(n) = floor(sqrt(13^n)). - Vincenzo Librandi, Jun 24 2011

Mathematica

Table[Floor[13^(n/2)], {n, 0, 30}] (* Stefan Steinerberger, Apr 15 2006 *)

Prog

(Magma) [Floor(Sqrt(13^n)): n in [0..30]]; // Vincenzo Librandi, Jun 24 2011
(PARI) a(n)=sqrtint(13^n) \\ Charles R Greathouse IV, Nov 18 2011

Crossrefs

Sequence in context: A378069 A350175 A239592 * A220117 A379154 A089930

Adjacent sequences: A017940 A017941 A017942 * A017944 A017945 A017946

Keyword

nonn

Author

N. J. A. Sloane

Status

approved