A388666 Decimal expansion of 2^(7/4) * exp(-Pi/4).

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

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} A143895(k) / exp(k*Pi).

Example

1.5335869488636653125462841936773634807...

Mathematica

First[RealDigits[2*2^(3/4)*Exp[-1/4*Pi], 10, 100]]

Prog

(PARI) 2 * exp(-Pi / 4) * 2^(3/4)

Crossrefs

Cf. A143895.

Sequence in context: A010038 A232109 A270753 * A393422 A198923 A056597

Adjacent sequences: A388663 A388664 A388665 * A388667 A388668 A388669

Keyword

nonn,cons

Author

Simon Plouffe, Sep 18 2025

Status

approved