不是。 OG12的定义： "A prime number is a positive integer that has exactly two diff erent positive divisors, 1 and itself. For example, 2, 3, 5, 7, 11, and 13 are prime numbers, but 15 is not, since 15 has four diff erent positive divisors, 1, 3, 5, and 15. The number 1 is not a prime number since it has only one positive divisor."
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发表于 2010-2-4 22:01:37
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