OFFSET
0,2
LINKS
Eric Weisstein's MathWorld, Multivariate Zeta Function
Wikipedia, Multiple zeta function
FORMULA
zetamult(4,2) = Sum_{m>=2} (Sum_{n=1..m-1} 1/(m^4*n^2)) = zeta(3)^2 - (4/3)*zeta(6).
EXAMPLE
0.088483382454368714294327839085760456647978752386750591674889276559474...
MATHEMATICA
Join[{0}, RealDigits[Zeta[3]^2 - (4/3)*Zeta[6], 10, 107] // First]
PROG
(PARI) zetamult([4, 2]) \\ Charles R Greathouse IV, Jan 21 2016
CROSSREFS
KEYWORD
AUTHOR
Jean-François Alcover, Jun 16 2015
STATUS
approved