I want to find the numerical value for the derivative of Dirichlet L function to compare with an another formula. However I am not able to obtain any numerical values. I tried to use
f[s_]= DirichletL[5,2,s] f'
But this simply returns
DirichletL^(0,0,1)[5,2,3]. If I use
N[f'] this gives:
DirichletL:: Positive integer expected at position 1 in DirichletL[5.,2.,2.].
Can someone please help me out with this? Any help is highly appreciated.