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A195731 Decimal expansion of arcsec(4). 2
1, 3, 1, 8, 1, 1, 6, 0, 7, 1, 6, 5, 2, 8, 1, 7, 9, 6, 5, 7, 4, 5, 6, 6, 4, 2, 5, 4, 6, 4, 6, 0, 4, 0, 4, 6, 9, 8, 4, 6, 3, 9, 0, 9, 6, 6, 5, 9, 0, 7, 1, 4, 7, 1, 6, 8, 5, 3, 5, 4, 8, 5, 1, 7, 4, 1, 3, 3, 3, 3, 1, 4, 2, 6, 6, 2, 0, 8, 3, 2, 7, 6, 9, 0, 2, 2, 6, 8, 6, 7, 0, 4, 4, 3, 0, 4, 3, 9, 3, 2 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
Equals arcsin(sqrt(15)/4) = arccos(1/4) = arctan(sqrt(15)). - Amiram Eldar, May 24 2021
EXAMPLE
arcsec(4) = 1.318116071652817965...
MATHEMATICA
r=4;
N[ArcSec[r], 100]
RealDigits[%]
PROG
(PARI) acos(1/4) \\ G. C. Greubel, Aug 20 2018
(Magma) SetDefaultRealField(RealField(100)); Arccos(1/4); // G. C. Greubel, Aug 20 2018
CROSSREFS
Cf. A195628.
Sequence in context: A141252 A276168 A165498 * A331187 A154294 A059526
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved

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Last modified July 31 20:34 EDT 2024. Contains 374808 sequences. (Running on oeis4.)