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%I #14 Sep 08 2022 08:45:59
%S 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,
%T 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,
%U 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
%N Decimal expansion of arcsec(4).
%H G. C. Greubel, <a href="/A195731/b195731.txt">Table of n, a(n) for n = 1..10000</a>
%F Equals arcsin(sqrt(15)/4) = arccos(1/4) = arctan(sqrt(15)). - _Amiram Eldar_, May 24 2021
%e arcsec(4) = 1.318116071652817965...
%t r=4;
%t N[ArcSec[r], 100]
%t RealDigits[%]
%o (PARI) acos(1/4) \\ _G. C. Greubel_, Aug 20 2018
%o (Magma) SetDefaultRealField(RealField(100)); Arccos(1/4); // _G. C. Greubel_, Aug 20 2018
%Y Cf. A195628.
%K nonn,cons
%O 1,2
%A _Clark Kimberling_, Sep 23 2011
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