A195711 Decimal expansion of arccos(-sqrt(5/8)).
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, 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, 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
Offset: 1
Examples
2.48253461776338...
Links
Crossrefs
Cf. A195707.
Programs
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Magma
SetDefaultRealField(RealField(100)); Arccos(-Sqrt(5/8)); // G. C. Greubel, Aug 19 2018
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Mathematica
(See A195707.) RealDigits[ArcCos[-Sqrt[(5/8)]],10,120][[1]] (* Harvey P. Dale, Mar 12 2013 *)
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PARI
acos(-sqrt(5/8)) \\ G. C. Greubel, Aug 19 2018
Formula
Equals Pi - arcsin(sqrt(3/8)) = Pi - arctan(sqrt(3/5)). - Amiram Eldar, Jul 06 2023