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A319883 Decimal expansion of the steradian solid angle subtended by one pentagonal facet of the icosidodecahedron. 4
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 (list; constant; graph; refs; listen; history; text; internal format)
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

2*Pi - 5*arctan(2).

20*A319881 + 12*A319883 = 4*Pi.

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 A085469 A050996

Adjacent sequences:  A319880 A319881 A319882 * A319884 A319885 A319886

KEYWORD

nonn,cons

AUTHOR

Bradley Klee, Sep 30 2018

STATUS

approved

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Last modified December 9 13:50 EST 2019. Contains 329877 sequences. (Running on oeis4.)