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Spenser
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Postdoc in mathematics.

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87
What is an odd prime?
46
Show $\sum_{n=0}^\infty\frac{1}{a^2+n^2}=\frac{1+a\pi\coth a\pi}{2a^2}$
43
Non-trivial open dense subset of $\mathbb{R}$.
40
Prove the divergence of the sequence $\left\{ \sin(n) \right\}_{n=1}^{\infty}$.
27
Sum of reciprocals of primes factorial: $\sum_{p\;\text{prime}}\frac{1}{p!}$