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A017934 Powers of sqrt(10) rounded down. 9
1, 3, 10, 31, 100, 316, 1000, 3162, 10000, 31622, 100000, 316227, 1000000, 3162277, 10000000, 31622776, 100000000, 316227766, 1000000000, 3162277660, 10000000000, 31622776601, 100000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also, number of squares <= 10^k, with k = 0, 1, 2, ...  - Paolo P. Lava, Jun 23 2014

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

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 16 20:35 EDT 2019. Contains 328103 sequences. (Running on oeis4.)