+160 A positive integer is called terrific if it has exactly 5 positive divisors. What is the smallest number of primes that could divide a terrific positive integer?
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A positive integer is called terrific if it has exactly 5 positive divisors. What is the smallest number of primes that could divide a terrific positive integer?
The smallest number of prime divisors is one.
As an example, 16 has 5 positive divisors: 1, 2, 4, 8, 16. 2 is a prime number.
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