They are all prime numbers because they have only two factors.
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Both values are prime, thus we conclude that the GCF (and the only common factor) is 1.
13 and 19 are both prime numbers. Their only common factor is ' 1 '.
13 and 19.
The first ten prime numbers containing a digit 1 are: 11 13 17 19 31 41 61 71 101 103
32 is a composite number while 13, 19 and 29 are prime numbers