0
Anonymous
1, 29
Wiki User
1, 31
They are: 2 and 11
2, 5, 10, 25
1, 2, 11 and 22
1, 3, 7, and 21 are.
1, 3, 11, 33.
1, 7, 13, 91.
1, 2, 4, 8, 16.
Its prime factors are 2 and 3
1, 2, 4, 5, 10, and 20
1, 2, 4, 31, 62, 124.
Only 1 and 13 so it's a prime number