123456789

This number is a composite.

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Replacing each of the digits, one-by-one with a 0, yields primes in three cases: 1, 2, and 7 (023456789, 103456789, and 123456089). Note that 127 is a Mersenne prime. [Trotter]

Submitted: 2001-08-07 20:12:35; Last Modified: 2008-01-30 11:28:00.