1 2 3 5 6 10 15 30.
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The sum of the positive whole-number factors of 30 is 72.
30 = 2 x 3 x 5 = 30
170
Since the numbers 29 and 30 share no common positive integer factors other than 1, 29/30 is already expressed in its simplest form.
Positive factors of 23: 1, 23 23 is a prime number.