5

This number is a prime.

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For the first five primes we have prime(2)*prime(4) - prime(1)*prime(3) = prime(5). It's interesting that we also have 2*4 - 1*3 = 5. [Firoozbakht]

Submitted: 2009-03-30 08:21:27; Last Modified: 2009-03-31 04:33:51.