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A195702 Decimal expansion of arccos(-sqrt(2/3)). 2
2, 5, 2, 6, 1, 1, 2, 9, 4, 4, 9, 1, 9, 4, 0, 5, 8, 9, 7, 3, 9, 5, 1, 7, 8, 7, 9, 4, 1, 5, 5, 5, 0, 9, 1, 9, 6, 3, 4, 1, 9, 9, 9, 3, 9, 4, 6, 9, 7, 5, 5, 8, 4, 0, 1, 4, 4, 7, 1, 7, 0, 4, 2, 5, 4, 7, 5, 8, 2, 0, 2, 4, 9, 0, 4, 7, 0, 8, 0, 9, 5, 4, 7, 0, 1, 4, 0, 9, 0, 1, 5, 2, 5, 6, 6, 8, 6, 6, 0, 7 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

arccos(-sqrt(2/3)) = 2.5261129449405...

MATHEMATICA

r = Sqrt[2/3];

N[ArcSin[r], 100]

RealDigits[%]  (* A195696 *)

N[ArcCos[r], 100]

RealDigits[%]  (* A195695 *)

N[ArcTan[r], 100]

RealDigits[%]  (* A195701 *)

N[ArcCos[-r], 100]

RealDigits[%]  (* A195702 *)

RealDigits[ArcCos[-Sqrt[(2/3)]], 10, 120][[1]] (* Harvey P. Dale, Jan 15 2013 *)

PROG

(PARI) acos(-sqrt(2/3)) \\ G. C. Greubel, Nov 18 2017

(MAGMA) [Arccos(-Sqrt(2/3))]; // G. C. Greubel, Nov 18 2017

CROSSREFS

Cf. A195701.

Sequence in context: A198604 A198253 A159989 * A309714 A309431 A198539

Adjacent sequences:  A195699 A195700 A195701 * A195703 A195704 A195705

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Sep 23 2011

STATUS

approved

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Last modified July 9 04:51 EDT 2020. Contains 335538 sequences. (Running on oeis4.)