A010592 Decimal expansion of cube root of 20.

2, 7, 1, 4, 4, 1, 7, 6, 1, 6, 5, 9, 4, 9, 0, 6, 5, 7, 1, 5, 1, 8, 0, 8, 9, 4, 6, 9, 6, 7, 9, 4, 8, 9, 2, 0, 4, 8, 0, 5, 1, 0, 7, 7, 6, 9, 4, 8, 9, 0, 9, 6, 9, 5, 7, 2, 8, 4, 3, 6, 5, 4, 4, 2, 8, 0, 3, 3, 0, 8, 5, 5, 6, 3, 2, 8, 7, 6, 5, 8, 4, 9, 4, 8, 7, 1, 9, 7, 3, 7, 6, 8, 5, 1, 5, 0, 1, 0, 4

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000 (a(5000) corrected by Sean A. Irvine)

Formula

Equals sqrt(2*sqrt(5*sqrt(2*sqrt(5*sqrt(2*sqrt(5)...))))). - Zak Seidov, Dec 19 2009

Example

2.71441761659490657151808946967948920480510776948909695728436544280330855632876...

Mathematica

RealDigits[N[20^(1/3), 200]][[1]] (* Vladimir Joseph Stephan Orlovsky, Feb 06 2012 *)
RealDigits[CubeRoot[20], 10, 120][[1]] (* Harvey P. Dale, Dec 27 2023 *)

Prog

(PARI) sqrtn(20, 3) \\ Charles R Greathouse IV, Apr 14 2014

Crossrefs

Cf. A010250 (continued fraction).

Sequence in context: A344930 A218792 A065254 * A096381 A346252 A346253

Adjacent sequences: A010589 A010590 A010591 * A010593 A010594 A010595

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved