A388340 Decimal expansion of 4 * exp(-7*Pi/8) * 2^(5/8).

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

Offset

0,1

Links

Table of n, a(n) for n=0..86.

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

Formula

Empirical: Equals Sum_{k>=0} A022616(k) / exp(k*Pi).

Example

0.39479753191614546515207858660087165339...

Mathematica

First[RealDigits[4*2^(5/8)*Exp[(-7*Pi)/8], 10, 100]]

Prog

(PARI) 4 * exp(-7/8 * Pi) * 2^(5/8)

Crossrefs

Cf. A022616.

Sequence in context: A021721 A212002 A199452 * A388677 A388887 A249414

Adjacent sequences: A388337 A388338 A388339 * A388341 A388342 A388343

Keyword

nonn,cons

Author

Simon Plouffe, Sep 15 2025

Status

approved