Hi everyone.
Could you plz tell me where the zero'szeros of $f(s)$ in the strip $\{0 < \Re s < 1 \}$ are ?
Do they all have $\Re s= 1/2$ ?
$$f(s) = 1 - 2^{-s} - 3^{-s} + 4^{-s} - 5^{-s} + ...$$
$$= \sum a(n)/n^s$$
with $a(n) = -1\\ $ if $n = -1 \mod 3\\ $ or $n = -1 \mod 4,\\ $ $a(n) = 1\\ $ otherwise.
$$f(s) = \zeta(s) - 2 \big[ 3^{-s} \zeta(s,-1/3) + 4^{-s} \zeta(s,-1/4) - 12^{-s} \zeta(s,-1/12) \big]$$
Could you plz give me some zero'szeros in the strip $\{0 < \Re z < 1 \}$?
Thanks.
Eta.