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• 95 Can we remove any prime number with this strange process?
• 63 Make 0 0 0 0 = 8
• 35 Is $100$ the only square number of the form $a^b+b^a$?
• 34 In molecular mechanics, how are van der Waals forces modelled?
• 30 Show that the maximum value of this nested radical is $\phi-1$
• 29 Let $A=(a_{ij})$ be an $n\times n$ matrix. Suppose that $A^2$ is diagonal. Must $A$ be diagonal?
• 28 Sum of digits of $a^b$ equals $ab$
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