A372338 Decimal expansion of Sum_{k>=0} (k+2) / ((k+1)*(2k)!).

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

Offset: 1

Author

Clark Kimberling, Apr 28 2024

Keywords

• nonn
• cons

Examples

			2.8073217524723591352868580804341...
		

Crossrefs

Cf. A073742, A073743, A372339.

Programs

Mathematica

s = Sum[(k + 2)/((k + 1) (2 k)!), {k, 0, Infinity}]
d = N[s, 100]
First[RealDigits[d]]

Formula

Equals -4/e + 2 + 3*cosh(1) - 2*sinh(1).

Equals 2*2F3(1,3; 1/2,2,2; 1/4). - R. J. Mathar, Aug 02 2024