| Prime numbers
Any natural number greater than 1 that is evenly divisible only by itself and 1.
There are infinitely many prime numbers. A nice prime number test made by Chris K. Caldwell: Why don’t try your telephone number or your birth-date. My birthdate is a prime number... The largest known prime today has more than 9,800,000 digits, the Mersenne prime 232582657-1. This is the 44th known Mersenne, announced in September 2005.
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