5

This number is a prime.

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π(1) + π(2) + π(3) + π(4) + π(5) = phi(1 + 2 + 3 + 4 + 5). It is the only number with this property. [Firoozbakht]

Submitted: 2010-05-07 15:44:08;   Last Modified: 2010-05-07 19:14:07.
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