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• 49 Enumeration of a finite group
• 24 What can be said about the Fourier transforms of characteristic functions?
• 23 Are sets with similar asymptotic behavior as the primes necessarily finite additive bases?
• 23 For integers $a \ge b > 1$ is $f(a,b) = a^b + b^a$ injective?
• 20 Natural numbers that cannot be expressed as a difference between a square and a prime?
• 18 Unconventional types of induction
• 18 All polynomials with no natural roots and integer coefficients such that $\phi(n)|\phi(P(n))$
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