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Anonymous
Proper factors do not include one and the number itself. The only one left is 2.
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2(a - 1)(2a + 1)
4b2-16 = (2b+4)(2b-4)
2, 4, 8
2 and 4
2, 4, 5, 10
Nine proper factors: 1 2 4 5 10 20 25 50 100.
2, 3, 4 and 6