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A019704 Decimal expansion of sqrt(Pi)/2. 4
8, 8, 6, 2, 2, 6, 9, 2, 5, 4, 5, 2, 7, 5, 8, 0, 1, 3, 6, 4, 9, 0, 8, 3, 7, 4, 1, 6, 7, 0, 5, 7, 2, 5, 9, 1, 3, 9, 8, 7, 7, 4, 7, 2, 8, 0, 6, 1, 1, 9, 3, 5, 6, 4, 1, 0, 6, 9, 0, 3, 8, 9, 4, 9, 2, 6, 4, 5, 5, 6, 4, 2, 2, 9, 5, 5, 1, 6, 0, 9, 0, 6, 8, 7, 4, 7, 5, 3, 2, 8, 3, 6, 9, 2, 7, 2, 3, 3, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

C. C. Clawson, The Beauty and Magic of Numbers. New York: Plenum Press (1996): 210.

LINKS

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Index to sequences related to the Gamma function

FORMULA

(1/2)! = Gamma(3/2) = sqrt(Pi)/2. - Benoit Cloitre, Apr 24 2003

Equals integral_{0, infinity} exp(-x^2) dx, or integral_{0, infinity} exp(-(x - 1/x)^2) dx, or also integral_{0, 1} sqrt(log(1/x)) dx.  [Jean-Fran├žois Alcover, Mar 28 2013]

Equals sqrt(A003881). - Michel Marcus, Aug 31 2014

EXAMPLE

sqrt(Pi)/2 = 0.886226925452758013649...

MATHEMATICA

RealDigits[Sqrt[Pi]/2, 10, 100][[1]] (* Alonso del Arte, Aug 15 2012 *)

CROSSREFS

Cf. A003881.

Sequence in context: A153619 A202497 A195708 * A140976 A253270 A021057

Adjacent sequences:  A019701 A019702 A019703 * A019705 A019706 A019707

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 28 00:41 EDT 2015. Contains 261101 sequences.