Every whole number has ' 1 ' as a factor, because ' 1 ' can
divide evenly into every whole number.
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The factors of 13 are 1 and 13. The factors of 2 are 1 and 2. Both 13 and 2 are prime numbers.
The common factors of 12 and 14 are 1 and 21 and 2
The factors of 91 are:1, 7, 13, 91The factors of 156 are:1, 2, 3, 4, 6, 12, 13, 26, 39, 52, 78, 156The common factors are:1, 13
1 and 13 are their only common factors.39: 1, 3, 13, 3965: 1, 5, 13, 65
The common factors of 13 and 52 are: 1 and 13