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URL: https://oeis.org/A388665

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A388665

Decimal expansion of 4*2^(3/4) * exp(-Pi/2).

1

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

(list; constant; graph; refs; listen; history; text; internal format)

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} A143894(k) / exp(k*Pi).

EXAMPLE

1.3984415244625323450802428482016927952...

MATHEMATICA

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

PROG

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

CROSSREFS

Sequence in context: A199052 A021255 A388573 * A394964 A388208 A229350

Adjacent sequences: A388662 A388663 A388664 * A388666 A388667 A388668

KEYWORD

nonn,cons

AUTHOR

Simon Plouffe, Sep 18 2025

STATUS

approved