A017961 Powers of sqrt(19) rounded down.

1, 4, 19, 82, 361, 1573, 6859, 29897, 130321, 568056, 2476099, 10793065, 47045881, 205068240, 893871739, 3896296578, 16983563041, 74029634996, 322687697779, 1406563064942, 6131066257801, 26724698233906

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..700

Crossrefs

Cf. A010475 (sqrt(19)).

Programs

Magma

[Floor(Sqrt(19^n)): n in [0..30]]; // Vincenzo Librandi, Jun 24 2011

Mathematica

Table[Floor[(Sqrt[19])^n],{n,0,30}] (* Harvey P. Dale, May 22 2014 *)

PARI

a(n)=sqrtint(19^n) \\ Charles R Greathouse IV, Nov 18 2011

Formula

a(n) = floor(sqrt(19^n)). - Vincenzo Librandi, Jun 24 2011