OFFSET
0,1
FORMULA
Equals Sum_{k>=0} (-1)^k/(k!*(k+1)!).
EXAMPLE
0.5767248077568733872...
MATHEMATICA
RealDigits[BesselJ[1, 2], 10, 100][[1]] (* Amiram Eldar, Oct 25 2021 *)
PROG
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Dumitru Damian, Oct 25 2021
STATUS
approved