A346438 Decimal expansion of the constant Sum_{k>=0} (-1)^k/(6*k)!.

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

Offset: 0

Author

Sean A. Irvine, Jul 17 2021

Keywords

• cons
• nonn

Examples

			0.9986111131987866537058529349...
		

Links

• Michael I. Shamos, A catalog of the real numbers (2011).

Crossrefs

Cf. A068985, A049470, A346441, A346440, A346439, A346437, A346436, A346435, A196498.

Programs

Mathematica

RealDigits[(Cos[1] + 2*Cos[1/2]*Cosh[Sqrt[3]/2])/3, 10, 120][[1]] (* Amiram Eldar, Jun 04 2023 *)

PARI

sumalt(k=0, (-1)^k/(6*k)!) \\ Michel Marcus, Jul 18 2021

Formula

Equals (cos(1) + 2*cos(1/2)*cosh(sqrt(3)/2))/3. - Amiram Eldar, Jun 04 2023