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 A102208 Decimal expansion of the volume of an icosahedron with unit edge length. 34
 2, 1, 8, 1, 6, 9, 4, 9, 9, 0, 6, 2, 4, 9, 1, 2, 3, 7, 3, 5, 0, 3, 8, 2, 2, 3, 6, 1, 9, 7, 1, 3, 6, 5, 0, 9, 8, 1, 0, 0, 2, 5, 7, 6, 4, 9, 8, 3, 8, 1, 3, 5, 7, 1, 8, 4, 4, 6, 2, 0, 7, 1, 8, 5, 5, 8, 7, 7, 1, 7, 0, 5, 2, 3, 4, 9, 0, 8, 5, 3, 7, 4, 7, 5, 6, 0, 0, 6, 0, 0, 3, 4, 9, 1, 1, 5, 9, 2, 8, 1 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Ivan Panchenko, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Icosahedron Wikipedia, Icosahedron - Area and volume Index entries for algebraic numbers, degree 2 FORMULA Equals 5 * (3 + sqrt(5))/12. Equals 5*phi^2/6, phi being the golden ratio. - Stanislav Sykora, Nov 23 2013 EXAMPLE 2.181694990624912373503822... MATHEMATICA RealDigits[N[5/12*(3+Sqrt[5]), 200]][[1]] (* Vladimir Joseph Stephan Orlovsky, Feb 21 2011 *) PROG (PARI) 5*(3 + sqrt(5))/12 \\ G. C. Greubel, Jul 06 2017 CROSSREFS Cf. A001622 (phi), A020829 (regular tetrahedron volume), A131594 (regular octahedron volume), A102769 (regular dodecahedron volume). Cf. A071402. Sequence in context: A284346 A318651 A083529 * A371650 A369779 A125911 Adjacent sequences: A102205 A102206 A102207 * A102209 A102210 A102211 KEYWORD cons,nonn AUTHOR Bryan Jacobs (bryanjj(AT)gmail.com), Feb 17 2005 STATUS approved

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Last modified July 23 23:47 EDT 2024. Contains 374575 sequences. (Running on oeis4.)