login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A249521 Decimal expansion of 4/sqrt(Pi), the average distance between two random Gaussian points in three dimensions. 3
2, 2, 5, 6, 7, 5, 8, 3, 3, 4, 1, 9, 1, 0, 2, 5, 1, 4, 7, 7, 9, 2, 3, 1, 7, 8, 0, 6, 2, 4, 3, 0, 9, 0, 3, 4, 3, 3, 7, 6, 2, 0, 2, 5, 1, 7, 3, 1, 5, 9, 9, 5, 4, 2, 7, 3, 7, 6, 3, 4, 2, 8, 8, 6, 8, 4, 2, 5, 6, 9, 8, 7, 3, 7, 6, 5, 9, 7, 3, 6, 5, 7, 9, 4, 6, 9, 7, 4, 6, 4, 0, 8, 0, 8, 4, 2, 9, 4, 5, 3, 7, 7, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Coordinates are independent normally distributed random variables with mean 0 and variance 1.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

Steven R. Finch, Random Triangles, January 21, 2010. [Cached copy, with permission of the author]

EXAMPLE

2.25675833419102514779231780624309034337620251731...

MATHEMATICA

RealDigits[4/Sqrt[Pi], 10, 103] // First

PROG

(PARI) 4/sqrt(Pi) \\ G. C. Greubel, Jan 09 2017

CROSSREFS

Cf. A002161 (the analog constant in two dimensions), A087197, A190732 (the analog constant in one dimension).

Sequence in context: A209527 A054255 A063177 * A034803 A205885 A239262

Adjacent sequences:  A249518 A249519 A249520 * A249522 A249523 A249524

KEYWORD

nonn,cons,easy

AUTHOR

Jean-François Alcover, Oct 31 2014

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 7 19:47 EST 2021. Contains 349585 sequences. (Running on oeis4.)