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A228497
Decimal expansion of the fourth root of 1/2.
6
8, 4, 0, 8, 9, 6, 4, 1, 5, 2, 5, 3, 7, 1, 4, 5, 4, 3, 0, 3, 1, 1, 2, 5, 4, 7, 6, 2, 3, 3, 2, 1, 4, 8, 9, 5, 0, 4, 0, 0, 3, 4, 2, 6, 2, 3, 5, 6, 7, 8, 4, 5, 1, 0, 8, 1, 3, 2, 2, 6, 0, 8, 5, 9, 7, 4, 9, 2, 4, 7, 5, 4, 9, 5, 3, 9, 0, 2, 2, 3, 9, 8, 1, 4, 3, 2, 4, 0, 0, 4, 1, 9, 9, 2, 9
OFFSET
0,1
FORMULA
One divided by A010767.
Square root of A010503.
Equals Product_{k>=1} (1 + (-1)^k/(4*k+1)). - Amiram Eldar, Aug 10 2020
EXAMPLE
0.841068670567930255...
MAPLE
evalf(1/root[4](2)) ;
MATHEMATICA
RealDigits[Surd[1/2, 4], 10, 120][[1]] (* Harvey P. Dale, Oct 05 2014 *)
PROG
(PARI) sqrtn(2, -4) \\ Charles R Greathouse IV, Apr 15 2014
CROSSREFS
Sequence in context: A103613 A104768 A199430 * A199285 A049255 A028577
KEYWORD
cons,nonn
AUTHOR
R. J. Mathar, Aug 23 2013
STATUS
approved