A388514 Decimal expansion of 8 * exp(-Pi / 2).

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

Offset

1,2

Links

Table of n, a(n) for n=1..87.

Simon Plouffe, Numbers in the base e^Pi, 2025.

Formula

Empirical: Equals Sum_{k>=0} A112142(k) / exp(k*Pi).

Example

1.6630366108060952683756449586798301603...

Mathematica

First[RealDigits[8*Exp[-1/2*Pi], 10, 100]]

Prog

(PARI) 8 * exp(-Pi / 2)

Crossrefs

Cf. A112142.

Sequence in context: A391673 A388241 A285814 * A154006 A143080 A011484

Adjacent sequences: A388511 A388512 A388513 * A388515 A388516 A388517

Keyword

nonn,cons

Author

Simon Plouffe, Sep 17 2025

Status

approved