A017934 Powers of sqrt(10) rounded down.

1, 3, 10, 31, 100, 316, 1000, 3162, 10000, 31622, 100000, 316227, 1000000, 3162277, 10000000, 31622776, 100000000, 316227766, 1000000000, 3162277660, 10000000000, 31622776601, 100000000000, 316227766016, 1000000000000, 3162277660168, 10000000000000, 31622776601683

Offset

0,2

Links

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

Formula

a(n) = floor(sqrt(10^n)). - Zak Seidov

Mathematica

Floor[Sqrt[10^Range[0, 100]]] (* Zak Seidov *)

Prog

(Magma) A017934 := func< n | Isqrt(10^n) >; // Jason Kimberley, Aug 19 2011
(Magma) A017934 := func< n | Floor(Sqrt(RealField(n)!10^n)) >; // Jason Kimberley, Aug 19 2011
(PARI) a(n)=sqrtint(10^n) \\ Charles R Greathouse IV, Nov 18 2011

Crossrefs

Cf. A010467 (decimal expansion of sqrt(10)), A131581, A136582, A175733, A175734.

Sequence in context: A002160 A214839 A114487 * A005510 A005725 A302287

Adjacent sequences: A017931 A017932 A017933 * A017935 A017936 A017937

Keyword

nonn,changed

Author

N. J. A. Sloane

Status

approved