The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 10.
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2 and 5 are the prime factors of 100.
The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
1, 5, 7, and 35 are the factors of 35. The proper factors are 5 and 7.
The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.
47 is a prime, so its only factors are 1 and 47. Prime numbers don't have "proper" factors.