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I wanted to evaluate the following sum psi(2n+1)/(2n+1)-psi(2n)/(2n) where n ranges from 1 to infinity and psi is the Chebyshev second function. So I wrote the following code. [mcode]Sum[ Sum[Floor[Log[Prime[k], 2x+1]] Log[Prime[k]]/(2x+1), {k, 1,...