A371506 - OEIS

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A371506

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

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

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..85.

FORMULA

(constant in A371507) - (this constant) = 1.00000055114638447971781305611...

EXAMPLE

0.508333057760143904931681150801...

MATHEMATICA

s = N[Sum[(-1)^k/((k^2 + 1)!), {k, 0, Infinity}], 120]

First[RealDigits[s]]