The factors of 13 are:
1, 13
The factors of 19 are:
1, 19
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13, 17, and 19
13 is a prime number. It is only evenly divisible by itself and one.The prime factors of 475 are: 5 and 19.
1, 13, 19, 29, 247, 377, 551, 7163
The factors of 10 are: 1, 2, 5, 10 The factors of 11 are: 1, 11 The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 13 are: 1, 13 The factors of 15 are: 1, 3, 5, 15 The factors of 16 are: 1, 2, 4, 8, 16 The factors of 17 are: 1, 17 The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 19 are: 1, 19 The factors of 20 are: 1, 2, 4, 5, 10, 20
13 and 19 aren't composite. 1,2,5,10 1,13 1,2,3,6,9,18 1,19