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• 27 How do I find an integer value for which an expression is non-prime?
• 15 Property of 111,111
• 13 How to prove $(6666\ldots66)^2 + 8888\ldots88 = 4444\ldots44$ (with $n$ 6s and 8s, $2n$ 4s)
• 12 $\frac{1}{A_1A_2}=\frac{1}{A_1A_3}+\frac{1}{A_1A_4}$.Then find the value of $n$
• 12 Let $0<a<1$, for which $x>0$ is $x^{a^x} = a^{x^a}$ true.
• 10 Finding $\int_{1/4}^4 \frac{1}{x}\sin(x-\frac{1}{x})\,dx $
• 7 Relationship between two integrals
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