3

This number is a prime.

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3 and 103 are prime, as are 3*2^103-1 and 103*2^3-1. There is no other pair of primes less than 1000 with this property. [Hartley]

Submitted: 2003-03-16 21:35:25;   Last Modified: 2008-01-30 11:28:00.
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