a potential typo fix

[XzWang29]

Description

In file "Prime_Numers.ipynb" cell 17, the author wrote:

Let $a$ be a number not divisible by $p$, then one of the following two conditions is true

would it be better if we switch

Let $a$ be a number not divisible by $p$

by

Let $a$ be any number not divisible by $p$" ?

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