OFFSET
0,1
FORMULA
Equals Sum_{k>=1} (-1)^(k+1) * H(k) / (k!)^2, where H(k) is the k-th harmonic number.
EXAMPLE
0.672462966936363624928336197862303184816824730553017...
MATHEMATICA
RealDigits[Pi BesselY[0, 2]/2 - EulerGamma BesselJ[0, 2], 10, 110] [[1]]
PROG
(PARI) Pi*bessely(0, 2)/2 - Euler*besselj(0, 2) \\ Michel Marcus, Apr 20 2022
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Ilya Gutkovskiy, Apr 20 2022
STATUS
approved