A010782 - OEIS

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A010782

Decimal expansion of 20th root of 2.

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

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OFFSET

1,3

LINKS

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

FORMULA

Equals Product_{k>=0} (1 + (-1)^k/(20*k + 19)). - Amiram Eldar, Aug 01 2020

MATHEMATICA

RealDigits[N[2^(1/20), 100]][[1]] (* Vladimir Joseph Stephan Orlovsky, Jan 25 2012 *)

RealDigits[Surd[2, 20], 10, 120][[1]] (* Harvey P. Dale, Feb 06 2020 *)

PROG

(PARI) sqrtn(2, 20) \\ Charles R Greathouse IV, Apr 15 2014