Analysis of information sources in references of the Wikipedia article "Euler's constant" in English language version.
The above sum is real and convergent when zeros and complex conjugate are paired together and summed according to increasing absolute values of the imaginary parts of .See formula 11 on page 3. Note the typographical error in the numerator of Wolf's sum over zeros, which should be 2 rather than 1.
It would also be interesting to develop an expansion for n! into powers of m, a new Stirling expansion, as it were.See formula 1.8 on page 3.
γ/2 in (10) reflects the residual (finite part) of ζ(1)/2, of course.See formulas 1 and 10.