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A236557
Vertex solid angle (steradians) in a regular icosahedron.
4
2, 6, 3, 4, 5, 4, 7, 0, 2, 6, 0, 4, 4, 7, 5, 4, 6, 5, 9, 6, 5, 1, 3, 0, 3, 4, 6, 7, 4, 9, 2, 4, 0, 2, 2, 9, 1, 4, 1, 1, 8, 0, 9, 2, 2, 8, 5, 1, 1, 6, 4, 3, 1, 8, 8, 4, 0, 5, 1, 4, 1, 7, 2, 7, 3, 0, 6, 5, 3, 8, 3, 1, 4, 2, 3, 8, 5, 8, 2, 3, 0, 3, 2, 7, 8, 6, 5, 2, 6, 1, 1, 5, 8, 6, 8, 6, 6, 6, 3, 4, 9, 2, 3, 8, 1
OFFSET
1,1
LINKS
Wikipedia, Platonic solid.
FORMULA
Equals 2*Pi - 5*arcsin(2/3).
EXAMPLE
2.6345470260447546596513034674924022914118092285116431884051417273...
MATHEMATICA
RealDigits[2*Pi - 5*ArcSin[2/3], 10, 120][[1]] (* Amiram Eldar, May 22 2023 *)
PROG
(PARI) 2*Pi-5*asin(2/3)
CROSSREFS
Cf. Analogs: A236555 (tetrahedron), A236556 (octahedron), A019669 (cube), A236558 (dodecahedron).
Sequence in context: A299160 A123733 A261069 * A359243 A262943 A357735
KEYWORD
nonn,cons,easy
AUTHOR
Stanislav Sykora, Jan 28 2014
STATUS
approved