Could I have a hint for testing the convergence of the following series please?
$$\sum_{n=2}^\infty\frac{1}{(\ln n)^{\ln n}}$$
Edit
The integral test does not work because $\int_1^n\frac{1}{(\ln x)^{\ln x}}dx$ has not an elementary primitive.
Thank You.
Answer
Alternate hint:
$$
(\ln n)^{\ln n} = n^{\ln \ln n}.
$$
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