Množina: prime numbers
An integer that has no integral factors but itself and 1.
Number that can be divided only by 1 or itself, that is, having no other factors. There is an infinite number of primes, the first ten of which are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29 (by definition, the number 1 is excluded from the set of prime numbers). The number 2 is the only even prime because all other even numbers have 2 as a factor.
Over the centuries mathematicians have sought general methods (algorithms) for calculating primes, from Eratosthenes' sieve to programs on powerful computers.
In 1989 researchers at Amdahl Corporation, Sunnyvale, California, calculated the largest known prime number. It has 65,087 digits, and is more than a trillion trillion trillion times as large as the previous record holder. It took over a year of computation to locate the number and prove it was a prime.
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