Tentu kan faktor bilangan berikt

15 = 1, 3,5, 15
16 = 1, 2, 3, 4, 8, 16
20= 1, 2, 4, 5, 10, 20
28 = 1, 2,4, 7, 14, 28
30 = 1, 2, 3, 5, 6 ,10, 15, 30