OFFSET
0,1
LINKS
Eric Weisstein's MathWorld, Multivariate Zeta Function
Wikipedia, Multiple zeta function
FORMULA
zetamult(3,3) = Sum_{m>=2} (Sum_{n=1..m-1} 1/(m^2*n^3)) = (9/2)*zeta(5) - 2*zeta(2)*zeta(3).
EXAMPLE
0.213798868224592547099583574508033649640958957865517556144512748947...
MATHEMATICA
RealDigits[(9/2)*Zeta[5] - 2*Zeta[2]*Zeta[3], 10, 103] // First
PROG
(PARI) zetamult([3, 3]) \\ Charles R Greathouse IV, Jan 21 2016
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Jun 16 2015
STATUS
approved