Thursday, 2 November 2017

real analysis - Convergence of $sum_{n=1}^{infty} frac{sin(n!)}{n}$

Is there a way to assess the convergence of the following series?
$$\sum_{n=1}^{\infty} \frac{\sin(n!)}{n}$$
From numerical estimations it seems to be convergent but I don't know how to prove it.

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