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倍数、约数与质数   题数:2
How many three-digit numbers begin with a digit which represents an odd number that is a prime, have a prime number as a second digit, and end with a digit that represents an odd number?
If n is a positive integer greater than 1, then p(n) represents the product of all the prime numbers less than or equal to n. The second smallest prime factor of p(12) + 11 is
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