A319883 Decimal expansion of the steradian solid angle subtended by one pentagonal facet of the icosidodecahedron.

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

Offset

0,1

Links

Table of n, a(n) for n=0..79.

Eric Weisstein's World of Mathematics, Icosidodecahedron

Eric Weisstein's World of Mathematics, Spherical Polygon

Formula

Equals 2*Pi - 5*arctan(2).

Equals (Pi - 5*A319881)/3.

Example

0.74744171820913396183995946566632056804410057174304...

Mathematica

RealDigits[2*Pi - 5*ArcTan[2], 10, 80][[1]]

Crossrefs

Cf. A319881. Cuboctahedron: A236555, A236556.

Sequence in context: A160575 A194361 A153586 * A153186 A343628 A085469

Adjacent sequences: A319880 A319881 A319882 * A319884 A319885 A319886

Keyword

nonn,cons

Author

Bradley Klee, Sep 30 2018

Status

approved