30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50
The perfect squares:
4: 1, 2 and 4
9: 1, 3 and 9
16: 1, 2, 4, 8 and 16
25: 1, 5 and 25
31, 37, 41, 43 and 47 have exactly 2 factors.
The others have more than 2.
2, 3, 5, 7, 11, 13, 17, 19, 23 and 29
The even numbers. 2, 4, 6 and so on.
The primes: 2,3,5,7,11,13,17 and 19.
31, 37, 41, 43, 47
Pick three.
22
16
1 and 5
It is 29 because it's a prime number
48
There are no common factors between these values since 11 is prime and 20 is composite. Then, there are no common prime factors between these values.
20 and 28 both have six factors.
The factors of 16 are 1, 2, 4, 8, and 16.
12, 18 and 20 each have six factors.
16 has five factors.
16 has five factors.
5, 10, 15 and 20 have five as a factor. The number 16 has five factors.
30 is the only number between 20 and 50 that is a factor of 60
12
16
16
16
16 does.