OFFSET
0,1
COMMENTS
Conjectured to be irrational, transcendental and normal, none have been shown.
LINKS
Lucian Craciun, Table of n, a(n) for n = 0..9900
StackExchange, Closed form for Product_{n>=2} (1-1/n!), Nov 11 2016.
Wolfram Alpha, Product_{n>=2} (1-1/n!).
FORMULA
Equals 1/A247551. - Amiram Eldar, Sep 15 2023
EXAMPLE
0.39533856736744556603235620043118061302665648675872...
MAPLE
evalf(product(1-1/n!, n = 2..infinity), 100); # Lucian Craciun, Feb 22 2017
MATHEMATICA
RealDigits[Product[1-1/n!, {n, 2, 70}], 10, 100][[1]] (* Robert G. Wilson v, Mar 19 2014 *)
PROG
(PARI) prodinf(n=3, 1-1/gamma(n)) \\ Charles R Greathouse IV, Nov 13 2014
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Lucian Craciun, Feb 22 2017
STATUS
approved