1,3,5.
3*5=15 so 3 and 5 are divisors of 15
The divisors of 45 are: 1, 3, 5, 9, 15, 45.
The divisors of 75 are: 1, 3, 5, 15, 25, 75.
15
75 has six divisors: 1, 3, 5, 15, 25, 75.
The divisors of 375 are: 1, 3, 5, 15, 25, 75, 125, 375.
The divisors of 645 are: 1, 3, 5, 15, 43, 129, 215, 645.
The divisors of 225 are: 1, 3, 5, 9, 15, 25, 45, 75, 225.
There are 8 divisors of 105 (viz: 1, 3, 5, 7, 15, 21, 35, 105)
15
The divisors of 150 are: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150.
The divisors of 1845 are: 1, 3, 5, 9, 15, 41, 45, 123, 205, 369, 615, 1845.