OFFSET
0,1
LINKS
FORMULA
Equals BesselJ(0,sqrt(2)).
Equals BesselI(0,sqrt(2)*i), where BesselI is the modified Bessel function of order 0. - Jianing Song, Sep 18 2021
EXAMPLE
1/(2^0*0!^2) - 1/(2^1*1!^2) + 1/(2^2*2!^2) - 1/(2^3*3!^2) + ... = 0.5591341444189799174882684679...
MATHEMATICA
RealDigits[BesselJ[0, Sqrt[2]], 10, 110] [[1]]
PROG
(PARI) besselj(0, sqrt(2)) \\ Michel Marcus, Apr 26 2020
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Apr 25 2020
STATUS
approved