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!)
A020832 Decimal expansion of 1/sqrt(75). 9
1, 1, 5, 4, 7, 0, 0, 5, 3, 8, 3, 7, 9, 2, 5, 1, 5, 2, 9, 0, 1, 8, 2, 9, 7, 5, 6, 1, 0, 0, 3, 9, 1, 4, 9, 1, 1, 2, 9, 5, 2, 0, 3, 5, 0, 2, 5, 4, 0, 2, 5, 3, 7, 5, 2, 0, 3, 7, 2, 0, 4, 6, 5, 2, 9, 6, 7, 9, 5, 5, 3, 4, 4, 6, 0, 5, 8, 6, 6, 6, 9, 1, 3, 8, 7, 4, 3, 0, 7, 9, 1, 1, 7, 1, 4, 9, 9, 0, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Multiplied by 10 this is 2/sqrt(3). - Alonso del Arte, Apr 30 2012

2/sqrt(3) is Hermite's constant gamma_2. - Jean-Fran├žois Alcover, Sep 02 2014, after Steven Finch.

LINKS

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

Steven R. Finch, Errata and Addenda to Mathematical Constants, p. 62.

Yining Hu, Patterns in numbers and infinite sums and products, arXiv:1506.00151 [math.NT], 2015.

FORMULA

(csc(Pi/3))/10, where csc is the cosecant function. - Alonso del Arte, Apr 30 2012

Product_{n>=1} ((3*n+1)/(3*n+2))^((-1)^n)), with offset 1. (see Hu link). - Michel Marcus, Jun 02 2015

EXAMPLE

0.1154700538379251529...

MATHEMATICA

RealDigits[1/Sqrt[75], 10, 100][[1]] (* Alonso del Arte, Apr 30 2012 *)

PROG

(PARI) 75^-.5 \\ Charles R Greathouse IV, Mar 31 2016

CROSSREFS

Cf. A010153 (continued fraction, but missing the initial 0).

Sequence in context: A019124 A019323 A244088 * A246724 A199276 A021870

Adjacent sequences:  A020829 A020830 A020831 * A020833 A020834 A020835

KEYWORD

nonn,cons,easy

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 7 20:56 EST 2016. Contains 278895 sequences.