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

0,2

Links

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

Formula

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

Mathematica

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

Prog

(Magma) [Floor(Sqrt(19^n)): n in [0..30]]; // Vincenzo Librandi, Jun 24 2011
(PARI) a(n)=sqrtint(19^n) \\ Charles R Greathouse IV, Nov 18 2011

Crossrefs

Cf. A010475 (sqrt(19)).

Sequence in context: A027240 A326649 A050914 * A180146 A017962 A260746

Adjacent sequences: A017958 A017959 A017960 * A017962 A017963 A017964

Keyword

nonn

Author

N. J. A. Sloane

Status

approved