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A243711
Decimal expansion of the fraction of the full solid angle subtended by an equilateral spherical triangle with a side length of 1 radian.
2
0, 3, 9, 4, 3, 8, 1, 8, 8, 7, 1, 3, 5, 8, 6, 4, 8, 1, 2, 0, 5, 1, 5, 1, 7, 8, 5, 7, 3, 8, 9, 1, 9, 0, 5, 6, 3, 7, 7, 3, 8, 2, 8, 9, 2, 5, 2, 4, 2, 8, 8, 6, 2, 7, 2, 3, 7, 1, 4, 7, 5, 1, 6, 4, 9, 1, 8, 7, 0, 5, 1, 5, 5, 9, 9, 6, 1, 3, 8, 1, 2, 2, 5, 5, 5, 9, 4, 0, 9, 1, 9, 1, 2, 5, 4, 4, 1, 6, 6, 7, 9, 5, 4, 1, 4, 8
OFFSET
0,2
COMMENTS
Same quantity as in A243710, but expressed as a fraction of the full solid angle of 4*Pi.
LINKS
FORMULA
Equals A243710/(4*Pi).
EXAMPLE
0.0394381887135864812051517857389190563773828925242886272371475...
MATHEMATICA
RealDigits[ArcTan[Sqrt[Tan[3/4]*Tan[1/4]^3]]/Pi, 10, 120, -1][[1]] (* Amiram Eldar, Jun 11 2023 *)
PROG
(PARI) atan(sqrt(tan(3/4)*tan(1/4)^3))/Pi
CROSSREFS
Cf. A243710.
Sequence in context: A050000 A154368 A321120 * A247553 A307238 A161773
KEYWORD
nonn,cons,easy
AUTHOR
Stanislav Sykora, Jun 08 2014
STATUS
approved