High Quality Content by WIKIPEDIA articles! In number theory, a unique prime is a certain kind of prime number. A prime p ? 2, 5 is called unique if there is no other prime q such that the period length of the decimal expansion of its reciprocal, 1 / p, is equivalent to the period length of the reciprocal of q, 1 / q. Unique primes were first described by Samuel Yates in 1. At present, more than fifty unique primes or probable primes are known. However, there are only twenty-three unique primes below 10100.

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