OFFSET
0,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..5000
Eric Weisstein's World of Mathematics, Octagon.
FORMULA
Equals i^(3/4) + i^(-3/4). - Gary W. Adamson, Jul 07 2022
Equals 2*sin(Pi/8) = 2*A182168. - Amiram Eldar, Apr 06 2023
Equals Product_ {k >= 0} ((8*k - 2)*(8*k + 10))/((8*k - 5)*(8*k + 13)). - Antonio GraciĆ” Llorente, Mar 11 2024
EXAMPLE
0.765366864730179543456919968060797733522689124971254082867601271255092067920...
MATHEMATICA
RealDigits[Sqrt[2-Sqrt[2]], 10, 120][[1]] (* Harvey P. Dale, Jun 22 2011 *)
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Jan 20 2005
STATUS
approved