nici prim, nici compus = 1
factor prim = 2
factor prim = 3
22 = 4
factor prim = 5
2 × 3 = 6
23 = 8
2 × 5 = 10
22 × 3 = 12
3 × 5 = 15
24 = 16
22 × 5 = 20
23 × 3 = 24
2 × 3 × 5 = 30
23 × 5 = 40
24 × 3 = 48
22 × 3 × 5 = 60
24 × 5 = 80
23 × 3 × 5 = 120
24 × 3 × 5 = 240