Double series expression for the Stieltjes constants

We present expressions in terms of a double infinite series for the Stieltjes constants $γ_k(a)$. These constants appear in the regular part of the Laurent expansion for the Hurwitz zeta function. We show that the case $γ_k(1)=γ$ corresponds to a series representation for the Riemann zeta function given much earlier by Brun. As a byproduct, we obtain a parameterized double series representation of the Hurwitz zeta function.

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