2, 3, 5, 6, 10, 15
1,2,3,5,6,10,12,15,30 Thirty has 9 factors.
There is only one proper common factor of 12 and 38; it is 2. Mathematicians do not consider 1 to be a proper factor, because it divides everything.
1 and 5
All of them.
1,2,3,5,6,30,15,10
No. Some proper factors are prime.
Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.
One has no proper factors.
1 doesn't have proper factors.
No, no prime number has proper factors.
2 and 3 are both factors of 30.
Proper factors do not include one and the number itself.