24

This number is a composite.

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In base 24, the square of any number relatively prime to the base (i.e., in this case, any number not divisible by 2 or 3) will end in the digit "1", and 24 is the largest base having this property. [Kerby]

Submitted: 2001-09-28 04:00:42; Last Modified: 2008-01-30 17:28:00.