10 (1, 2, 5, 10)
18 (1, 2, 9, 18)
22 (1, 2, 11, 22)
etc.
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14 (I think).
0, 1, 2, 3
Numbers with exactly 6 factors are perfect squares of prime numbers. The prime factorization of a number with exactly 6 factors is in the form ( p^2 ), where ( p ) is a prime number. There are 10 prime numbers less than 30: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. So, there are 10 numbers less than 30 that have exactly 6 factors.
All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.
All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.