Thursday 18 July 2013

Test for convergence of the series $sum_{n=2}^inftyfrac{1}{(ln n)^{ln n}}$



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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