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A195710 Decimal expansion of arccos(-sqrt(2/5)). 3
2, 2, 5, 5, 5, 1, 5, 5, 2, 9, 7, 9, 7, 1, 7, 9, 5, 3, 3, 1, 1, 9, 4, 1, 9, 7, 6, 1, 3, 5, 0, 8, 1, 5, 4, 5, 8, 0, 2, 7, 8, 5, 8, 0, 0, 8, 8, 3, 0, 2, 1, 5, 1, 7, 2, 6, 0, 2, 5, 8, 2, 8, 2, 2, 5, 0, 3, 0, 5, 7, 6, 1, 7, 4, 0, 0, 2, 3, 0, 8, 2, 3, 7, 8, 3, 1, 0, 3, 6, 5, 3, 9, 6, 1, 3, 8, 7, 8, 3, 2 (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(2/5)) = 2.25551552979717...

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. A195708, A195701.

Sequence in context: A239005 A213187 A317921 * A321304 A280511 A200997

Adjacent sequences:  A195707 A195708 A195709 * A195711 A195712 A195713

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Sep 23 2011

STATUS

approved

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Last modified October 21 06:25 EDT 2019. Contains 328292 sequences. (Running on oeis4.)