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A010780 Decimal expansion of 18th root of 2. 1
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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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

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

Sequence in context: A201664 A103824 A155080 * A309275 A179655 A076420

Adjacent sequences:  A010777 A010778 A010779 * A010781 A010782 A010783

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 21 06:14 EST 2021. Contains 340333 sequences. (Running on oeis4.)