1 3 5 15.
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1, 2, 3, 5, 6, 10 and 15. Some people do not consider 1 to be a proper factor.
Since the numbers 15 and 22 share no common positive integer factors other than 1, the proper fraction 15/22 is already expressed in its simplest form.15/22 is in its simplest form.
Prime numbers don't have proper factors.
The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
The proper factors of 16 are 1,2,4, and 8 :)