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13:

14: 2, 7

15: 3, 5

16: 2, 4, 8

17:

18: 2, 3, 6, 9

19:

20: 2, 4, 5, 10

21: 3, 7

22: 2, 11

23:

24: 2, 3, 4, 6, 8, 12

25: 5

26: 2, 13

27: 3, 9

28: 2, 4, 7, 14

29:

30: 2, 3, 5, 6, 10, 15

31:

32: 2, 4, 8, 16

If we define proper factors as regular factors without one and the number itself, prime numbers do not have proper factors.

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