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A371934
Decimal expansion of Sum_{k>=0} (-1)^k / ((k+1)*(2*k)!).
0
7, 6, 3, 5, 4, 6, 5, 8, 1, 3, 5, 2, 0, 7, 2, 4, 4, 8, 1, 0, 6, 8, 7, 7, 8, 5, 8, 1, 4, 6, 5, 5, 1, 2, 0, 6, 7, 0, 9, 7, 4, 6, 9, 6, 2, 8, 3, 2, 5, 8, 6, 5, 8, 6, 6, 8, 5, 6, 9, 7, 9, 3, 0, 7, 4, 6, 0, 2, 1, 5, 9, 8, 3, 3, 1, 4, 2, 2, 8, 6, 6, 9, 3, 3, 1, 8
OFFSET
0,1
FORMULA
Equals 2*(A143623 - 1).
EXAMPLE
0.7635465813520724481068778581465512067097...
MAPLE
hypergeom([1], [1/2, 2], -1/4) ; evalf(%) ; # R. J. Mathar, Jul 03 2024
MATHEMATICA
s = N[Sum[(-1)^k/((k + 1) (2 k)!), {k, 0, Infinity}], 120]
First[RealDigits[s]]
CROSSREFS
Sequence in context: A198374 A225450 A238239 * A199437 A021571 A013675
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Apr 24 2024
STATUS
approved