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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A019889 Decimal expansion of sine of 80 degrees. 4
9, 8, 4, 8, 0, 7, 7, 5, 3, 0, 1, 2, 2, 0, 8, 0, 5, 9, 3, 6, 6, 7, 4, 3, 0, 2, 4, 5, 8, 9, 5, 2, 3, 0, 1, 3, 6, 7, 0, 6, 4, 3, 2, 5, 1, 7, 1, 9, 8, 4, 2, 4, 1, 8, 7, 9, 0, 0, 2, 5, 7, 5, 2, 3, 5, 5, 8, 2, 7, 5, 9, 9, 9, 4, 3, 0, 3, 6, 2, 3, 9, 2, 7, 4, 6, 7, 8, 4, 1, 0, 0, 5, 6, 1, 1, 9, 8, 9, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Also the real part of I^(1/9). - Stanislav Sykora, Nov 29 2013

Equals sin(4*Pi/9). - Wesley Ivan Hurt, Sep 01 2014

LINKS

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

FORMULA

Equals 2F1(7/12,5/12;1/2;3/4) / 2. [R. J. Mathar, Oct 27 2008]

EXAMPLE

0.9848077530122080593667430245895230136706432517198424187900...

MAPLE

Digits:=100: evalf(sin(4*Pi/9)); # Wesley Ivan Hurt, Sep 01 2014

MATHEMATICA

RealDigits[ Cos[Pi/18], 10, 111] (* Robert G. Wilson v *)

PROG

(PARI) real(I^(1/9)) \\ Michel Marcus, Nov 29 2013

CROSSREFS

Sequence in context: A199862 A019720 A200117 * A243266 A010548 A011458

Adjacent sequences:  A019886 A019887 A019888 * A019890 A019891 A019892

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 March 24 05:55 EDT 2017. Contains 283984 sequences.