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Euclid-Euler theorem

The Euclid–Euler theorem is a theorem in number theory that relates perfect numbers to Mersenne primes. It states that an even number is perfect if and only if it has the form $2 p -1 (2 p - 1)$ , where $2 p - 1$ is a prime number. The theorem is named after mathematicians Euclid and Leonhard Euler, who respectively proved the "if" and "only if" aspects of the theorem.
It has been conjectured that there are infinitely many Mersenne primes. Although the truth of this conjecture remains unknown, it is equivalent, by the Euclid–Euler theorem, to the conjecture that there are infinitely many even perfect numbers. However, it is also unknown whether there exists even a single odd perfect number.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Euclid%E2%80%93Euler_theorem)

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