A367730 Decimal expansion of BesselJ(0,2/sqrt(3)).
6, 9, 3, 4, 3, 6, 7, 8, 8, 1, 7, 9, 1, 8, 3, 1, 9, 0, 0, 9, 7, 7, 6, 0, 4, 6, 3, 3, 3, 3, 5, 4, 3, 9, 3, 1, 9, 7, 3, 2, 0, 9, 9, 5, 6, 2, 5, 3, 8, 6, 6, 5, 5, 5, 0, 9, 3, 4, 4, 4, 6, 5, 8, 3, 6, 6, 9, 3, 2, 6, 0, 3, 5, 4, 9, 3, 3, 5, 5, 6, 4, 1, 2, 9, 9, 8, 2, 1, 2, 7, 3, 0, 3, 2, 9, 0, 1, 6, 3
Offset: 0
Examples
0.69343678817918319009776046333354393...
Programs
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Mathematica
RealDigits[BesselJ[0, 2/Sqrt[3]], 10, 99][[1]]
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PARI
besselj(0,2/sqrt(3)) \\ Michel Marcus, Nov 29 2023
Formula
Equals Sum_{k>=0} 1 / ((-3)^k * k!^2).