OFFSET
1,1
COMMENTS
Derived from an infinite sum of the Bell numbers (see formula below).
May also be written as exp(exp(1))/exp(1) = e^e/e.
LINKS
Michael Ian Shamos, Shamos's catalog of the real numbers, (2011).
FORMULA
Equals Sum_{n>=0} Bell(n)/n!, where Bell(n) = A000110(n).
Equals Product_{k=1..oo} exp(1/k!). - Christoph B. Kassir, Dec 04 2021
EXAMPLE
5.5749415247608806239669759227404843057060930975947002119298237838570...
MATHEMATICA
RealDigits[Exp[E-1], 10, 100][[1]] (* Amiram Eldar, Dec 04 2021 *)
PROG
(PARI) exp(exp(1)-1)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Richard R. Forberg, Dec 26 2013
STATUS
approved