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08/08/2012 06:13 AM CDT

Twenty-three. It’s the ninth prime number. An Eisenstein prime with no imaginary part and real part of the form 3n − 1.  The first prime P for which unique factorization of cyclotomic integers based on the Pth root of unity breaks down. It’s also the number of mathematical challenges listed here that could land you a spot in the history books (if you solve one – or [...]