124

This number is a composite.

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The concatenation of 1^124, 2^124, 3^124, 4^124, 5^124, 6^124, and 7^124 in order is a 463-digit prime number. [Gaydos]

Submitted: 2015-08-06 23:25:11; Last Modified: 2016-08-14 18:35:37.