%I #12 Oct 25 2021 13:59:02

%S 5,7,6,7,2,4,8,0,7,7,5,6,8,7,3,3,8,7,2,0,2,4,4,8,2,4,2,2,6,9,1,3,7,0,

%T 8,6,9,2,0,3,0,2,6,8,9,7,1,9,6,7,5,4,4,0,1,2,1,1,3,9,0,2,0,7,6,4,0,8,

%U 7,1,1,6,2,8,9,6,1,2,1,8,4,9,4,8,3,9,9

%N Decimal expansion of BesselJ(1,2).

%F Equals Sum_{k>=0} (-1)^k/(k!*(k+1)!).

%e 0.5767248077568733872...

%t RealDigits[BesselJ[1, 2], 10, 100][[1]] (* _Amiram Eldar_, Oct 25 2021 *)

%o (Sage)

%o bessel_J(1, 2).n(digits=100)

%o (PARI) besselj(1, 2) \\ _Michel Marcus_, Oct 25 2021

%Y Cf. A010790, A054687, A058798, A058797, A133920, A245308, A296168, A301484, A318224.

%Y Bessel function values: A334380 (J(0,1)), A091681 (J(0,2)), A334383 (J(0,sqrt(2)), this sequence (J(1,2)), A197036 (I(0,1)), A070910 (I(0,2)), A334381 (I(0,sqrt(2)), A096789 (I(1,2)).

%K nonn,cons

%O 0,1

%A _Dumitru Damian_, Oct 25 2021