Post Closed as "not a real question" by Igor Rivin, Chandan Singh Dalawat, Dan Petersen, Andres Caicedo, Brendan McKay

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Looking for elementary poof proof source

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Looking for elementary poof source

I am looking for proof of the following result in elementary form ( Powell/ 1983, Kearnes/ 1984):

For any positive integer N, there exist infinitely many primes p such that N < {smallest primitive root mod p} < p — N.