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A210583 Decimal expansion of (9/2)*Pi. 0
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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
2,2
LINKS
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
KEYWORD
nonn,cons
AUTHOR
Mats Granvik, Mar 23 2012
STATUS
approved

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Last modified April 18 10:44 EDT 2024. Contains 371779 sequences. (Running on oeis4.)