A371498 Decimal expansion of Sum_{k>=0} ((-1)^k)/(k^2)!.

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

Offset: 0

Author

Clark Kimberling, Mar 30 2024

Keywords

• nonn
• cons

Examples

			0.0416639109347920628509252203182...
		

Crossrefs

Cf. A371499.

Programs

Mathematica

s[x_] := s[x] = Sum[x^n/((n^2)!), {n, 0, Infinity}]
First[RealDigits[N[s[-1], 100]]]

PARI

suminf(k=0,((-1)^k)/(k^2)!) \\ Hugo Pfoertner, Mar 30 2024

Formula

(Constant in A371499) - (this constant) = 2.00000551146384...