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The positive integer factors of 493 are: 1, 17, 29, 493
The positive integer factors of 45 are 1, 3, 5, 9, 15, 45.
All numbers have factors. The factors that are positive numbers are known as positive factors.
All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are called common factors. Some factors are positive numbers. Common factors which are positive numbers would be called positive common factors.
They are 1 and 17 because 17 is a prime number which has only two factors