If the definition you are using considers 1 to be a proper factor (some teachers say yes, some say no) then add the number 1 to this list.
2,3,6,9
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The factors of 18 are: 1, 2, 3, 6, 9, 18
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 :)
Prime numbers don't have proper factors.
1, 5, 7, and 35 are the factors of 35. The proper factors are 5 and 7.