23

This number is a prime.

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Kristen Eller ©2002

Digits [2|3] is the only 2-digit number that is prime in 5(2+3) different base numbers equal or below base (10): 23(10)=23, 23(8)=19, 23(7)=17, 23(5)=13, and 23(4)=11! [Elthon]