Hurwitz zeta
From specialfunctionswiki
The Hurwitz zeta function is defined for $\Re(s)>1$, $$\zeta(s,a)= \displaystyle\sum_{n=0}^{\infty} \dfrac{1}{(n+a)^s}.$$
The Hurwitz zeta function is defined for $\Re(s)>1$, $$\zeta(s,a)= \displaystyle\sum_{n=0}^{\infty} \dfrac{1}{(n+a)^s}.$$