31139
This number is a prime.
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31139 = (π(3!) + π(1!) + π(1!) + π(3!) + π(9!)) + (π(3!2) + π(1!2) + π(1!2) + π(3!2) + π(9!2)). Note that prime 31139 is the only odd number with this property. [Firoozbakht]
Submitted: 2004-08-24 15:07:45; Last Modified: 2008-01-30 17:28:00.
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