13: 1, 13
14: 1, 2, 7, 14
15: 1, 3, 5, 15
16: 1, 2, 4, 8, 16
17: 1, 17
18: 1, 2, 3, 6, 9, 18
19: 1, 19
20: 1, 2, 4, 5, 10, 20
21: 1, 3, 7, 21
22: 1, 2, 11, 22
23: 1, 23
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The common factors are: 1, 23.
23 is prime. Prime numbers don't have proper factors.
The factors of 17 are: 1, 17 The factors of 23 are: 1, 23 The common factors are: 1 The Greatest Common Factor: 1
the factors of 23 is 1 and 23,which is itself, thus it is also known as a prime number.
1 and 23.