OFFSET
0,3
FORMULA
4*Product_{k>=0} (1 - 1/(2^k+1)) = 0.838844883590215195...
PROG
(PARI) contfrac(4*prod(k=0, 1000, 1-1./(2^k+1)))
CROSSREFS
KEYWORD
cofr,nonn
AUTHOR
Benoit Cloitre, Jun 19 2003
STATUS
approved