A388330 Decimal expansion of 2 * exp(-5*Pi/12) * 2^(1/4).

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

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} A022605(k) / exp(k*Pi).

Example

0.64238789283583347821388745936419247449...

Mathematica

First[RealDigits[2*2^(1/4)*Exp[(-5*Pi)/12], 10, 100]]

Prog

(PARI) 2 * exp(-5/12 * Pi) * 2^(1/4)

Crossrefs

Cf. A022605.

Sequence in context: A125214 A114062 A338136 * A028975 A145011 A173625

Adjacent sequences: A388327 A388328 A388329 * A388331 A388332 A388333

Keyword

nonn,cons

Author

Simon Plouffe, Sep 15 2025

Status

approved