OFFSET
0,3
REFERENCES
Tom M. Apostol, Calculus, Vol. 1, John Wiley & Sons, 1967 (2nd ed.). This constant is the case s=t=3 in sum(sin(n*s)/n^t, n>=1), see p. 409.
FORMULA
Equals sum(sin(3*k)/k^3, k>=1).
EXAMPLE
0.1162187299676445228762978875591940782132185550264072...
MATHEMATICA
RealDigits[(Pi - 3) (2 Pi - 3)/4, 10, 90][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Bruno Berselli, Mar 25 2013
STATUS
approved