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 A344075 Decimal expansion of arccos(-sqrt((5+2*sqrt(5))/15)). 0
 2, 4, 8, 9, 2, 3, 4, 5, 1, 3, 8, 0, 5, 4, 2, 5, 0, 5, 2, 4, 6, 7, 2, 5, 2, 7, 5, 1, 6, 3, 5, 6, 8, 0, 3, 0, 9, 8, 3, 1, 8, 6, 1, 4, 7, 9, 4, 1, 2, 1, 2, 6, 0, 7, 9, 1, 8, 0, 2, 1, 6, 6, 4, 5, 6, 0, 1, 6, 7, 2, 8, 2, 2, 4, 6, 5, 1, 6, 9, 4, 6, 5, 7, 1, 8, 4, 6, 7, 6, 8, 0, 9 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Decimal expansion of the dihedral angle (radians) of an icosidodecahedron. Equals approximately 142.62 degrees. LINKS Table of n, a(n) for n=1..92. Wikipedia, Icosidodecahedron EXAMPLE 2.489234513805425052467... MATHEMATICA RealDigits[ArcCos[-Sqrt[(5 + 2 Sqrt[5])/15]], 10, 200][[1]] PROG (PARI) acos(-sqrt((5+2*sqrt(5))/15)) \\ Michel Marcus, May 09 2021 CROSSREFS Cf. A179450 (icosidodecahedron volume), A179451 (icosidodecahedron surface area). Sequence in context: A193846 A255908 A341107 * A011402 A131625 A196000 Adjacent sequences: A344072 A344073 A344074 * A344076 A344077 A344078 KEYWORD cons,nonn AUTHOR Wesley Ivan Hurt, May 08 2021 STATUS approved

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Last modified September 8 08:54 EDT 2024. Contains 375753 sequences. (Running on oeis4.)