Thursday, February 22, 2007

What's Special About This Number?

What's Special About This Number? : Math trivia! Like: did you know 0 is the additive identity. 1 is the multiplicative identity. 2 is the only even prime. . . . . . . 9998 is the smallest number n for which the concatenation of n, (n+1), ... (n+21) is prime. 9999 is a Kaprekar number.

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