login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 A021057 A241058

Adjacent sequences:  A019701 A019702 A019703 * A019705 A019706 A019707

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 28 14:16 EST 2014. Contains 250361 sequences.