A017935 Powers of sqrt(10) rounded to nearest integer.

1, 3, 10, 32, 100, 316, 1000, 3162, 10000, 31623, 100000, 316228, 1000000, 3162278, 10000000, 31622777, 100000000, 316227766, 1000000000, 3162277660, 10000000000, 31622776602, 100000000000, 316227766017, 1000000000000, 3162277660168, 10000000000000

Offset

0,2

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1994 (truncated by Georg Fischer, Apr 27 2019)

Formula

a(n) = round(10^(n/2)).

Maple

a:= proc(n) Digits:= 10+iquo(n, 2): round(sqrt(10)^n) end:
seq(a(n), n=0..40);  # Alois P. Heinz, Apr 27 2019

Mathematica

Floor[(Sqrt[10]^Range[0, 40]+1/2)] (* Vincenzo Librandi, Nov 19 2011 *)

Prog

(PARI) a(n)=round(sqrt(10)^n) \\ Charles R Greathouse IV, Nov 18 2011
(Magma) [Round(Sqrt(10)^n): n in [0..40]]; // Vincenzo Librandi, Nov 19 2011

Crossrefs

Sequence in context: A053581 A247595 A092822 * A134377 A278133 A077826

Adjacent sequences: A017932 A017933 A017934 * A017936 A017937 A017938

Keyword

nonn

Author

N. J. A. Sloane

Status

approved