The factors of 13 are 1 and 13.
The factors of 16 are 1, 2, 4, 8, and 16.
The only common factor is 1. Therefore, 1 is the greatest common factor. This means 13 and 16 are relatively prime. 1, in whole numbers.
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The greatest common factor for 16 and 38 is 2.
The greatest common factor of 16 and 34 is 2.
The greatest common factor for 15 and 16 is 1.
The greatest common factor of 16 and 28 is 4
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.