A195731 Decimal expansion of arcsec(4).

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

Offset: 1

Author

Clark Kimberling, Sep 23 2011

Keywords

• nonn
• cons

Examples

			arcsec(4) = 1.318116071652817965...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 1..10000
• Index entries for transcendental numbers

Crossrefs

Cf. A195628.

Programs

Magma

SetDefaultRealField(RealField(100)); Arccos(1/4); // G. C. Greubel, Aug 20 2018

Mathematica

r=4;
N[ArcSec[r], 100]
RealDigits[%]

PARI

acos(1/4) \\ G. C. Greubel, Aug 20 2018

Formula

Equals arcsin(sqrt(15)/4) = arccos(1/4) = arctan(sqrt(15)). - Amiram Eldar, May 24 2021