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Positive integers $p$, $n$, and $y$, with $p$ being a prime, are such that $p^n=y^4 + 4$.

Find $p+n+y$.

A five digit number N has all digits different and contains digits 1,3,4,5, and 6 only. If N is the smallest possible number such that it is ...

Find the number solutions in positive integers to the equation: $m^2-n^2=2mn$.

How many of the answers are prime?

What is this number $\text{MMMDCCCLXXXVIII}$?

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