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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A195708 Decimal expansion of arccos(sqrt(2/5)) and of arcsin(sqrt(3/5)). 3
8, 8, 6, 0, 7, 7, 1, 2, 3, 7, 9, 2, 6, 1, 3, 7, 0, 5, 3, 4, 3, 2, 2, 3, 6, 2, 1, 9, 2, 8, 6, 8, 7, 4, 2, 6, 1, 6, 9, 3, 1, 1, 3, 9, 0, 5, 4, 4, 8, 9, 0, 6, 4, 8, 3, 7, 2, 3, 6, 1, 7, 6, 9, 8, 0, 4, 7, 5, 8, 7, 8, 8, 8, 8, 5, 9, 7, 8, 1, 7, 4, 8, 4, 4, 9, 3, 1, 1, 7, 1, 3, 8, 0, 7, 2, 9, 2, 3, 5, 4 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..5000

EXAMPLE

arccos(sqrt(2/5)) = 0.886077123792...

MATHEMATICA

r = Sqrt[1/5]; s = Sqrt[2/5];

N[ArcSin[r], 100]

RealDigits[%]  (* A073000 *)

N[ArcCos[r], 100]

RealDigits[%]  (* A105199 *)

N[ArcTan[r], 100]

RealDigits[%]  (* A188595 *)

N[ArcCos[-r], 100]

RealDigits[%]  (* A137218 *)

N[ArcSin[s], 100]

RealDigits[%]  (* A195701 *)

N[ArcCos[s], 100]

RealDigits[%]  (* A195708 *)

N[ArcTan[s], 100]

RealDigits[%]  (* A195709 *)

N[ArcCos[-s], 100]

RealDigits[%]  (* A195710 *)

PROG

(PARI) acos(sqrt(2/5)) \\ G. C. Greubel, Nov 18 2017

(MAGMA) [Arccos(Sqrt(2/5))]; // G. C. Greubel, Nov 18 2017

CROSSREFS

Cf. A073000, A105199, A195701.

Sequence in context: A030171 A153619 A202497 * A019704 A140976 A253270

Adjacent sequences:  A195705 A195706 A195707 * A195709 A195710 A195711

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Sep 23 2011

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 August 13 06:22 EDT 2020. Contains 336442 sequences. (Running on oeis4.)