41
15 and 2
2 + 3 + 5 = 10
41
A perfect number, like 6.
3, 12, 30
The least common factor of any set of integers is 1.
a proper factor is a factor.
It is 15*(1 + 2)
154 is the sum of the proper factors of 256.
(5 x 6) + (9 x 6) = 14 x 6 = 84
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.Since the children are at school, and the sum of their ages, which are factors of the mother's age, is also a factor of the mother's age, then the children ages are 5 and 10 years old.
1, 2, 3, 5, 6, 10 and 15. Some people do not consider 1 to be a proper factor.