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41 Interesting and unexpected applications of $\pi$ Aug 20 '15
39 How to show $e^{e^{e^{79}}}$ is not an integer Jun 15 '11
31 A very curious rational fraction that converges. What is the value? Jun 21 '16
22 how to find the balls? Jun 7 '11
17 How to prove that $k^3+3k^2+2k$ is always divisible by $3$? Feb 4 '16
12 $f(f(x))=f(x)$ question Feb 19 '14
12 The set of natural number functions is uncountable Feb 22 '14
11 How are the elementary arithmetics defined? Nov 6 '14
11 Find all polynomials $P$ such that $P(x^2+1)=P(x)^2+1$ Jan 7 '13
11 Mathematical Invariant Oct 21 '13
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