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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.
None The even numbers 60, 72, 84, 90, and 96 each have 12 factors
Prime numbers
There are four odd numbers less that 100 that have 6 factor. This does not compare with even numbers that have 12 factors!
10,20,30,40,50,60,70,80,90