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The only factor of 1 is 1.2 is a prime number. It is only evenly divisible by itself and one.3 is a prime number. It is only evenly divisible by itself and one.5 is a prime number. It is only evenly divisible by itself and one.7 is a prime number. It is only evenly divisible by itself and one.The factors of 9 are: 1, 3, and 9.The only prime factor of 9 is: 3.11 is a prime number. It is only evenly divisible by itself and one.
1 has one factor: itself.11 has two factors: one and itself.
31 is a prime number meaning it is only divisible by 1 and itself. since 31 is the largest number the only common factor is 1
Technically, 7 is a prime number so itself and 1 are the only candidates. If you consider 1 to be a factor, then the only common factor is 1, which is not useful in any application I know.
The factor pair of 17 is 1*17. Because 17 is prime, it has only one factor pair.