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A354249
Decimal expansion of 27*sqrt(3) / (2*Pi).
0
7, 4, 4, 2, 9, 4, 0, 0, 8, 8, 1, 9, 4, 1, 9, 2, 6, 6, 8, 4, 0, 2, 9, 0, 7, 7, 2, 7, 2, 2, 5, 0, 8, 7, 4, 5, 8, 8, 6, 4, 7, 1, 7, 4, 8, 4, 9, 4, 9, 6, 4, 8, 8, 1, 2, 7, 9, 1, 4, 4, 1, 2, 7, 3, 9, 2, 8, 9, 0, 9, 0, 9, 6, 8, 3, 5, 1, 4, 2, 2, 3, 0, 3, 4, 5, 1, 3, 0, 3, 8, 9, 1, 1, 2, 8, 0, 7, 0, 0, 4, 3
OFFSET
1,1
COMMENTS
For any triangle ABC (see Crux Mathematicorum):
(sin(A) + sin(B) + sin(C)) * (1/A + 1/B + 1/C) >= 27*sqrt(3) / (2*Pi),
where (A,B,C) are the angles in radians.
Equality stands iff triangle ABC is equilateral.
LINKS
Shi-Chang Chi and Ji Chen, Douglas L. Grant, Problem 2015, Crux Mathematicorum, Vol. 22, No. 1 (1996), pp. 47-48.
FORMULA
Equals A010527 * A132717.
EXAMPLE
7.442940088194192668402907727...
MAPLE
evalf(27*sqrt(3)/(2*Pi), 110);
MATHEMATICA
RealDigits[(27*Sqrt[3]/(2*Pi)), 10, 110][[1]] (* Amiram Eldar, May 21 2022; corrected by Georg Fischer, Aug 04 2024 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Bernard Schott, May 20 2022
EXTENSIONS
a(100) corrected by Georg Fischer, Aug 04 2024
STATUS
approved