A010780 Decimal expansion of 18th root of 2.

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

Offset

1,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

Index entries for algebraic numbers, degree 18.

Formula

Equals Product_{k>=0} (1 + (-1)^k/(18*k + 17)). - Amiram Eldar, Aug 01 2020

Mathematica

RealDigits[Power[2, (18)^-1], 10, 120][[1]] (* Harvey P. Dale, Jul 14 2011 *)

Prog

(PARI) sqrtn(2, 18) \\ Charles R Greathouse IV, Apr 15 2014

Crossrefs

Cf. k-th root of 2: A002193 (k=2), A002580 (k=3), A010767 (k=4), A005531 (k=5), A010768-A010782 (k=6-20).

Sequence in context: A201664 A103824 A155080 * A309275 A179655 A357472

Adjacent sequences: A010777 A010778 A010779 * A010781 A010782 A010783

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved