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31 and Mersenne Primes - Numberphile
31 is one of the special Mersenne Prime numbers. They are related to perfect numbers. More links & stuff in full description below ↓↓↓ See our perfect number video at http://www.youtube.com/watch?v=ZfKTD5lvToE This video features Dr James Grime. All our presenters are featured at http://www.numberphile.com/team/index.html NUMBERPHILE ...
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