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A102209 Decimal expansion of ratio of both the surface area and the volume of an icosahedron to a dodecahedron with the same inradius. 0
9, 1, 0, 5, 9, 2, 9, 9, 7, 3, 1, 0, 0, 2, 9, 3, 3, 4, 6, 4, 3, 0, 8, 7, 3, 7, 2, 1, 2, 9, 9, 7, 7, 8, 8, 6, 0, 3, 8, 8, 7, 0, 2, 9, 0, 7, 1, 7, 1, 5, 1, 1, 6, 4, 1, 4, 0, 3, 9, 4, 7, 0, 6, 8, 3, 1, 8, 1, 0, 9, 3, 4, 7, 4, 6, 2, 6, 6, 6, 8, 7, 9, 1, 2, 7, 4, 4, 9, 9, 9, 1, 7, 5, 1, 3, 8, 7, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..97.

Eric Weisstein's World of Mathematics, Dodecahedron

Eric Weisstein's World of Mathematics, Icosahedron

FORMULA

sqrt(3/10 * (5 - sqrt(5)))

MATHEMATICA

RealDigits[Sqrt[3/10*(5-Sqrt[5])], 10, 120][[1]] (* Harvey P. Dale, Aug 07 2018 *)

CROSSREFS

Sequence in context: A248414 A176980 A227817 * A222131 A156546 A154839

Adjacent sequences:  A102206 A102207 A102208 * A102210 A102211 A102212

KEYWORD

cons,nonn

AUTHOR

Bryan Jacobs (bryanjj(AT)gmail.com), Feb 17 2005

STATUS

approved

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Last modified March 29 02:19 EDT 2020. Contains 333104 sequences. (Running on oeis4.)