Is it possible to derive divisibility rules for any prime number?

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Divisibility rules for weird numbers like 7 and 13 are hard to understand. This video will explain why these divisibility rules work, as well as how to derive some of your own.
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Wow, so honored! "THE FORMULAS OF NONPRIMES REVEALING ALL THE PRIME NUMBERS" was named one of the best new Arithmetic books by BookAuthority!

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