A179449 Decimal expansion of the volume of great icosahedron with edge length 1.

3, 1, 8, 3, 0, 5, 0, 0, 9, 3, 7, 5, 0, 8, 7, 6, 2, 6, 4, 9, 6, 1, 7, 7, 6, 3, 8, 0, 2, 8, 6, 3, 4, 9, 0, 1, 8, 9, 9, 7, 4, 2, 3, 5, 0, 1, 6, 1, 8, 6, 4, 2, 8, 1, 5, 5, 3, 7, 9, 2, 8, 1, 4, 4, 1, 2, 2, 8, 2, 9, 4, 7, 6, 5, 0, 9, 1, 4, 6, 2, 5, 2, 4, 3, 9, 9, 3, 9, 9, 6, 5, 0, 8, 8, 4, 0, 7, 1, 8, 7, 6, 2, 7, 0, 4

Offset

1,1

Comments

Great icosahedron: 20 faces, 12 vertices, and 30 edges.

Links

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

Eric Weisstein's World of Mathematics, Great Icosahedron

Wikipedia, Great Icosahedron

Index entries for algebraic numbers, degree 2

Formula

Digits of 5/12 * (3-sqrt(5)).

Example

0.31830500937508762649617763802863490189974235016186428155379281441228294...

Mathematica

RealDigits[N[5*(Sqrt[5]-3)/12, 105]][[1]]

Crossrefs

Cf. A010527, A102208, A179290, A179292, A179294.

Sequence in context: A273927 A293975 A185452 * A049541 A352939 A249757

Adjacent sequences: A179446 A179447 A179448 * A179450 A179451 A179452

Keyword

nonn,cons,easy

Author

Vladimir Joseph Stephan Orlovsky, Jul 14 2010

Extensions

Partially rewritten by Charles R Greathouse IV, Feb 02 2011

Status

approved