In this paper, we consider the
zeta function Z(P,χ,s) associated with a polynomial P(X) ∈ ℝ[X1,…,Xr] and
χ = (χ1,…,χr) with χj non-trivial Dirichlet characters, defined by
which is absolutely convergent for sufficiently large Re s under some conditions
on P(X). We shall prove that the special value Z(P,χ,−m) is completely
determined by Pm(X) in a simple way. As an immediate application, we give a
closed expression for sums of products of any number of generalized Bernoulli
numbers.
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