1,2,3,5,6,10,12,15,30 Thirty has 9 factors.
1,2,3,5,6,30,15,10
1 and 5
One has no proper factors.
All of them.
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.
No. Some proper factors are prime.
No, no prime number has proper factors.
One has no proper factors.
1 doesn't have proper factors.
Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.
Prime numbers don't have proper factors.