7

This number is a prime.

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7*6*5*4*3*2*1 + 7654321 is a 7-digit prime with first digit 7 and 1*2*3*4*5*6*7 + 1234567 is a 7-digit prime with last digit 7. [Silva]

Submitted: 2008-10-08 19:40:20; Last Modified: 2008-10-12 20:53:33.