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
KEYWORD
cons,nonn
AUTHOR
R. J. Mathar, Aug 23 2013
STATUS
approved