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• 33 On the polynomial $\sum_{k=0}^n\binom{n}{k}(-1)^kX^{k(n-k)}$
• 23 A finite alternating sum
• 20 The $2\pi$ in the definition of the Fourier transform
• 19 Inverse of special upper triangular matrix
• 18 Harmonic sums and elementary number theory
• 14 Prove that $x$ is an integer if $x^4-x$ and $x^3-x$ are integers.
• 13 Happy $\pi$-day! Is it true that $\sum_{p \;\text{prime} } \frac{1}{{\pi}^p} < \pi -\lfloor \pi \rfloor$?
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