A388379 Decimal expansion of 2 * exp(-3*Pi/8) * 2^(7/8).

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

Offset

1,3

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} A029840(k) / exp(k*Pi).

Example

1.1292500258611222402209251002586198332...

Mathematica

First[RealDigits[2*2^(7/8)*Exp[(-3*Pi)/8], 10, 100]]

Prog

(PARI) 2 * exp(-3/8 * Pi) * 2^(7/8)

Crossrefs

Cf. A029840.

Sequence in context: A221139 A217273 A188981 * A277754 A112537 A165715

Adjacent sequences: A388376 A388377 A388378 * A388380 A388381 A388382

Keyword

nonn,cons

Author

Simon Plouffe, Sep 15 2025

Status

approved