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A372367
Decimal expansion of Sum_{k>=0} (-1)^k*(k+1) / (k^2+1).
1
3, 6, 6, 4, 0, 4, 0, 2, 4, 7, 8, 3, 0, 5, 7, 5, 9, 9, 6, 7, 3, 6, 2, 3, 3, 2, 4, 1, 8, 3, 9, 4, 7, 8, 5, 8, 9, 7, 0, 3, 5, 7, 0, 9, 2, 2, 2, 9, 9, 8, 5, 7, 7, 4, 4, 6, 2, 2, 7, 6, 0, 2, 3, 2, 4, 3, 4, 7, 4, 7, 4, 7, 7, 5, 9, 7, 2, 4, 6, 0, 8, 4, 9, 3, 8, 9
OFFSET
0,1
EXAMPLE
0.3664040247830575996736233241839478589703570922299...
MATHEMATICA
s = Sum[ (-1)^k (k + 1)/(k^2 + 1), {k, 0, Infinity}]
d = Chop[N[s, 100]]
First[RealDigits[d]]
CROSSREFS
Cf. A372387.
Sequence in context: A258271 A105396 A247685 * A185735 A339021 A197263
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, May 12 2024
STATUS
approved