A380703 Decimal expansion of the obtuse vertex angle, in radians, in a (small) triakis octahedron face.
2, 0, 4, 5, 5, 3, 5, 8, 3, 8, 3, 4, 9, 1, 6, 7, 7, 4, 9, 4, 0, 0, 9, 1, 6, 8, 1, 7, 6, 3, 8, 2, 4, 5, 5, 2, 7, 2, 3, 7, 7, 4, 4, 6, 7, 2, 0, 5, 6, 6, 9, 7, 1, 8, 6, 9, 8, 3, 8, 4, 7, 7, 1, 4, 5, 8, 7, 1, 3, 7, 5, 3, 5, 1, 9, 3, 2, 3, 8, 0, 8, 7, 8, 4, 8, 1, 6, 4, 1, 9
Offset: 1
Examples
2.045535838349167749400916817638245527237744672...
Links
- Paolo Xausa, Table of n, a(n) for n = 1..10000
- Wikipedia, Triakis octahedron.
Programs
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Mathematica
First[RealDigits[ArcCos[1/4 - Sqrt[2]/2], 10, 100]]