MountEvariste
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1. For $(a,b) = 1$ and prime $p\ne 2$, prove that $\displaystyle \left(a+b, \frac{a^p+b^p}{a+b}\right) = 1$ or $p$.
[sp]If $q$ is a prime divisor of $a+b$ then $q$ cannot divide $a$ or $b$ (because $a$ and $b$ are coprime).MountEvariste said:1. For $(a,b) = 1$ and prime $p\ne 2$, prove that $\displaystyle \left(a+b, \frac{a^p+b^p}{a+b}\right) = 1$ or $p$.