A210583 Decimal expansion of (9/2)*Pi.

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

Offset

2,2

Links

Table of n, a(n) for n=2..91.

Index entries for transcendental numbers

Formula

Equals (9/2)*A000796.

Equals the Bessel moment Integral_{0..inf} x^4 K_0(x) dx, where K_0 is the modified Bessel function of the second kind. - Jean-François Alcover, May 31 2016

Equals 10 * Sum_{k>=1} sin(k*Pi/10)/k. - Amiram Eldar, May 30 2021

Example

14.137166941154069573...

Maple

evalf(9*Pi/2) ;

Mathematica

RealDigits[N[(9/2)*Pi, 90]][[1]]

Prog

(PARI) 9/2*Pi \\ Charles R Greathouse IV, Oct 01 2022

Crossrefs

Cf. A000796.

Sequence in context: A190479 A074813 A151861 * A200171 A109531 A200132

Adjacent sequences: A210580 A210581 A210582 * A210584 A210585 A210586

Keyword

nonn,cons

Author

Mats Granvik, Mar 23 2012

Status

approved