11

This number is a prime.

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11 has the primitive root g = 2, meaning the remainders after dividing 2ⁿ by 11 assume all values 1, 2, ... 10, exactly once as n goes from 1 to 10.

Submitted: 1999-09-02 23:40:00; Last Modified: 2011-08-01 17:35:01.