# 643

This number is a prime.

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According to "The New Book of Prime Number Records," the
product of the first 643 primes plus one is prime. This
integer consists of 2038 digits and is known in MATHEMATICA
as Euclid [643]. Also note that 643 is a prime. [Schiffman]
Submitted: 2010-11-20 15:17:32; Last Modified: 2010-12-06 08:34:30.

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