331

This number is a prime.

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331 = 11*13*17-2^2*3*5^2*7, using only the potential prime divisors (with multiplicity) up to the square root; and they use all of them. Can you find an expression for the next prime (337) in such a way? [Wood]

Submitted: 2009-09-27 18:53:30;   Last Modified: 2020-01-03 06:28:55.
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