666

This number is a composite.

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666 is the largest three-digit repdigit such that the product of itself and all truncations of itself plus one is prime. I.e., 666*66*6 + 1 is prime. [Opao]

Submitted: 2003-12-14 23:54:59;   Last Modified: 2018-02-04 10:20:19.
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