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n-1-tan-1-n-n-2-1-

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Question Number 122917 by Dwaipayan Shikari last updated on 20/Nov/20
Σ_(n=1) ^∞ ((tan^(−1) n)/(n^2 +1))
$$\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{{tan}^{−\mathrm{1}} {n}}{{n}^{\mathrm{2}} +\mathrm{1}} \\ $$

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