761
This number is a prime.
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761 = prime(761) - (7!2 * 6!2 * 1!2). Note that 761 is the smallest prime with this property. [Firoozbakht]
761 = (π(7!) + π(6!) + π(1!)) - (π(7!2) + π(6!2) + π(1!2))). Note that prime 761 is the only number with this property. [Firoozbakht]
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