20, 40, 60, 80
The ones with less than three factors.
They all are prime numbers except 1
The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.
144, 121 and 100
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
14 (I think).
6, 8 and 10 are three out of 32 possible answers.
30, 42, 66, 70 and 78.
4, 9, 25, and 49
4, 9, 25, 49
42 and its next three multiples.
0, 1, 2, 3