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A179290 Decimal expansion of length of edge of a regular icosahedron with radius of circumscribed sphere = 1. 24
1, 0, 5, 1, 4, 6, 2, 2, 2, 4, 2, 3, 8, 2, 6, 7, 2, 1, 2, 0, 5, 1, 3, 3, 8, 1, 6, 9, 6, 9, 5, 7, 5, 3, 2, 1, 4, 5, 7, 0, 9, 9, 5, 8, 6, 4, 4, 8, 6, 6, 8, 3, 5, 6, 3, 0, 5, 7, 8, 7, 1, 0, 4, 6, 4, 8, 2, 4, 2, 2, 2, 9, 2, 8, 0, 6, 4, 2, 8, 0, 3, 6, 7, 4, 3, 2, 6, 5, 2, 5, 7, 6, 6, 3, 1, 0, 5, 1, 4, 1, 9, 1, 3, 3, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Regular icosahedron: A three dimensional figure with 20 congruence equilateral triangle faces, 12 vertices, and 30 edges.

LINKS

Table of n, a(n) for n=1..105.

J. Brandts, S. Korotov, M. Krizek, J. Solc, On nonobtuse simplicial partitions, Siam Rev. 51 (2) (2009) 317-335

"Dr. Math", Regular Polyhedra: Formulas

Wikipedia, Icosahedron

Eric Weisstein's World of Mathematics, Icosahedron

FORMULA

Digits of sqrt(50-10*sqrt(5))/5.

EXAMPLE

1.051462224238267212051338169695753214570995864486683563057871046482422...

MATHEMATICA

R=1; RealDigits[N[(Sqrt[50-10*Sqrt[5]]/5)*R, 175]]

CROSSREFS

Cf. A010527, A102208.

Sequence in context: A200022 A216157 A216851 * A167864 A232809 A011301

Adjacent sequences:  A179287 A179288 A179289 * A179291 A179292 A179293

KEYWORD

nonn,cons,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jul 09 2010

EXTENSIONS

Partially rewritten by Charles R Greathouse IV, Feb 02 2011.

STATUS

approved

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Last modified April 16 21:07 EDT 2014. Contains 240627 sequences.