A027663 a(n)/100000 gives sqrt(n) to 5 places after the decimal point.

100000, 141421, 173205, 200000, 223607, 244949, 264575, 282843, 300000, 316228, 331662, 346410, 360555, 374166, 387298, 400000, 412311, 424264, 435890, 447214, 458258, 469042, 479583, 489898, 500000, 509902, 519615, 529150, 538516, 547723, 556776, 565685, 574456

Offset

1,1

Links

Table of n, a(n) for n=1..33.

Maple

lprint(round(evalf(100000*sqrt(n))));

Mathematica

Table[Floor[FromDigits[RealDigits[Sqrt[n], 10, 7][[1]]]/10+1/2], {n, 30}] (* Harvey P. Dale, Jan 31 2012 *)

Prog

(Python)
from math import isqrt
def A027663(n): return (m:=isqrt(k:=n*10**10))+int((k-m*(m+1)<<2)>=1) # Chai Wah Wu, Jul 30 2022

Crossrefs

Cf. A027662, A027664.

Sequence in context: A204523 A182698 A033427 * A168652 A277399 A017177

Adjacent sequences: A027660 A027661 A027662 * A027664 A027665 A027666

Keyword

nonn,base

Author

N. J. A. Sloane

Status

approved