31

This number is a prime.

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The prime number 31 is also a repunit in three different bases: 31 is 11111 in base 2; it is 111 in base 5, and it is 11 in base 30. [Dobb]

Submitted: 2002-05-05 22:18:43; Last Modified: 2008-01-30 17:28:00.