Wieferich prime

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Science and technology

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What Wikipedia says

In number theory, a Wieferich prime is a prime number p such that p2 divides 2p − 1 − 1, therefore connecting these primes with Fermat's little theorem, which states that every odd prime p divides 2p − 1 − 1.

Excerpt from the Wikipedia article “Wieferich prime”, under the CC BY-SA 4.0 license. Read the article on Wikipedia