I want to calculate the series of the Basel problem ∞∑n=11n2 by applying the Euler series transformation. With some effort I got that
ζ(2)2=∞∑n=1Hnn2n.
I know that series like the ∞∑n=1Hnn2n are evaluated here, but the evaluations end up with some values of the ζ function, like ζ(2),ζ(3).
First approach: Using the generating function of the harmonic numbers and integrating term by term, I concluded that
∞∑n=1Hnn2n=∫120ln(1−x)x(x−1)dx,
but I can't evaluate this integral with any real-analytic way.
First question: Do you have any hints or ideas to evaluate it with real-analytic methods?
Second approach: I used the fact that Hnn=n∑k=11k(n+k) and then, I changed the order of summation to obtain
∞∑n=1Hnn2n=∞∑k=12kk(∞∑m=2k1m2m).
To proceed I need to evaluate the
∫120x2k−11−xdx,
since ∞∑m=2k1m2m=∫120x2k−11−xdx.
Second question: How can I calculate this integral?
Thanks in advance for your help.
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