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%I #18 Jul 06 2023 01:53:14
%S 2,4,8,2,5,3,4,6,1,7,7,6,3,3,8,4,2,5,5,5,8,9,8,1,1,2,5,5,9,5,6,4,8,2,
%T 6,4,9,2,7,3,9,7,3,9,1,6,0,7,9,7,4,8,4,6,2,5,4,8,1,7,0,3,3,3,6,0,1,1,
%U 4,9,8,3,4,9,5,5,1,6,7,3,6,0,1,7,6,9,0,0,4,9,0,1,2,0,5,9,5,1,0,1
%N Decimal expansion of arccos(-sqrt(5/8)).
%H G. C. Greubel, <a href="/A195711/b195711.txt">Table of n, a(n) for n = 1..10000</a>
%F Equals Pi - arcsin(sqrt(3/8)) = Pi - arctan(sqrt(3/5)). - _Amiram Eldar_, Jul 06 2023
%e 2.48253461776338...
%t (See A195707.)
%t RealDigits[ArcCos[-Sqrt[(5/8)]],10,120][[1]] (* _Harvey P. Dale_, Mar 12 2013 *)
%o (PARI) acos(-sqrt(5/8)) \\ _G. C. Greubel_, Aug 19 2018
%o (Magma) SetDefaultRealField(RealField(100)); Arccos(-Sqrt(5/8)); // _G. C. Greubel_, Aug 19 2018
%Y Cf. A195707.
%K nonn,cons
%O 1,1
%A _Clark Kimberling_, Sep 23 2011
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