A388518 Decimal expansion of 2 * exp(-Pi/6).

1, 1, 8, 4, 7, 6, 9, 6, 9, 4, 3, 7, 6, 7, 7, 7, 9, 6, 7, 3, 3, 0, 8, 3, 2, 6, 6, 5, 3, 2, 3, 8, 3, 8, 9, 7, 4, 8, 2, 8, 2, 2, 8, 2, 9, 1, 4, 7, 0, 9, 1, 7, 5, 7, 7, 1, 7, 3, 2, 2, 8, 6, 6, 2, 6, 2, 6, 9, 6, 6, 4, 7, 7, 6, 7, 4, 6, 3, 5, 8, 6, 9, 9, 6, 8, 2, 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} A112160(k) / exp(k*Pi).

Example

1.1847696943767779673308326653238389748...

Mathematica

First[RealDigits[2*Exp[-1/6*Pi], 10, 100]]

Prog

(PARI) 2 * exp(-1/6 * Pi)

Crossrefs

Cf. A112160.

Sequence in context: A388189 A387592 A388920 * A388758 A179260 A254246

Adjacent sequences: A388515 A388516 A388517 * A388519 A388520 A388521

Keyword

nonn,cons

Author

Simon Plouffe, Sep 17 2025

Status

approved