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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

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 *)

PROG

(PARI) gammah(1) \\ Michel Marcus, Feb 11 2016

(PARI) sqrt(Pi)/2 \\ Michel Marcus, Feb 11 2016

(MAGMA) pi:=Sqrt(Pi(RealField(110)))/ 2; Reverse(Intseq(Floor(10^110*pi))); // Vincenzo Librandi, Feb 11 2016

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

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

License Agreements, Terms of Use, Privacy Policy .

Last modified December 10 03:42 EST 2016. Contains 278993 sequences.