A017955 Powers of sqrt(17) rounded down.

1, 4, 17, 70, 289, 1191, 4913, 20256, 83521, 344365, 1419857, 5854220, 24137569, 99521746, 410338673, 1691869691, 6975757441, 28761784747, 118587876497, 488950340714, 2015993900449, 8312155792152, 34271896307633, 141306648466586, 582622237229761, 2402213023931974

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..800

Crossrefs

Cf. A000196, A001026 (even bisection), A010473 (sqrt(17)).

Programs

Magma

[Floor(Sqrt(17^n)): n in [0..30]]; // Vincenzo Librandi, Jun 24 2011

PARI

a(n)=sqrtint(17^n) \\ Charles R Greathouse IV, Nov 18 2011

Formula

a(n) = floor(sqrt(17^n)) = A000196(A001026(n)). - Vincenzo Librandi, Jun 24 2011