OFFSET
0,3
COMMENTS
Suggested by Bill Gosper's remarkable identity (in a posting to math-fun list, Apr 14 2005) (replace dots by spaces to make this more visible): Product_{ n >= 0 } tanh(2^n x)^(1/2^n) = (1-exp(-2*x))^2.
CROSSREFS
KEYWORD
sign,frac
AUTHOR
N. J. A. Sloane, Apr 17 2005
STATUS
approved