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A371502
Decimal expansion of Sum_{k>=0} (-1)^k / (k^2 + k + 1)!.
2
8, 3, 3, 5, 3, 1, 7, 4, 5, 8, 7, 1, 1, 5, 5, 5, 9, 3, 3, 9, 7, 3, 8, 8, 5, 4, 1, 1, 0, 1, 2, 1, 3, 3, 9, 9, 6, 6, 2, 8, 2, 5, 6, 8, 5, 7, 2, 6, 1, 9, 9, 4, 1, 0, 6, 2, 1, 0, 7, 6, 5, 1, 5, 3, 5, 3, 9, 5, 4, 6, 8, 4, 3, 9, 2, 7, 7, 6, 5, 2, 0, 9, 3, 6, 6, 2
OFFSET
1,1
FORMULA
(constant in A371503) - (this constant) = 0.33333333365451421006976562532...
EXAMPLE
0.833531745871155593397388541101...
MATHEMATICA
s=Sum[(-1)^n/((n^2 + n + 1)!), {n, 0, Infinity}]; First[RealDigits[N[s, 100]]]
CROSSREFS
Cf. A371503.
Sequence in context: A168356 A021016 A269296 * A334363 A200230 A069995
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 04 2024
STATUS
approved