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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Proper factors are factors of the number except the number itself. So, with that said, the proper factors of 38 are 1, 2, and 19.
13 is a Prime number. It is only evenly divisible by itself and one.
The factors of 16 are: 1, 2, 4, 8, and 16.
The only prime factor of 16 is: 2.
The factors of 13 are 1 and 13. For them to be common, they need to be compared to another set of factors.
factors: 1, 7, 23, 161prime factors: 7, 23
Factors for 2 are: 1, 2 Factors for 3 are: 1, 3 Factors for 4 are: 1, 2, 4 Factors for 5 are: 1, 5 Factors for 6 are: 1, 2, 3, 6 Factors for 7 are: 1, 7 Factors for 8 are: 1, 2, 4, 8 Factors for 9 are: 1, 3, 9 Factors for 10 are: 1, 2, 5, 10 Factors for 11 are: 1, 11 Factors for 12 are: 1, 2, 3, 4, 6, 12 Factors for 13 are: 1, 13 Factors for 14 are: 1, 2, 7, 14 Factors for 15 are: 1, 3, 5, 15 Factors for 16 are: 1, 2, 4, 8, 16
The greatest common factor of 16 and 26 is 2 The factors of 16 are: 1, 2, 4, 8, 15 The factors of 26 are: 1, 2, 13, 26 The GCF is 2.
The factors of 26 are: 1, 2, 13, and 26. The prime factors of 26 are: 2 and 13. The factors of 39 are: 1, 3, 13, and 39. The prime factors of 39 are: 3 and 13.
The factors of 13 are: 1, 13 The factors of 26 are: 1, 2, 13, 26