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Q: What are the proper factors of 13?

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The proper factors of 26 are 2 and 13

Prime numbers don't have proper factors.

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1,2,and 13

3 and 13

3 and 13

5 and 13

The proper factors of 130 are 2, 5, 10, 13, 26 and 65.

2, 4, 13, 26

91 has 4 factors (2 of them which are proper). Those factors are:{1, 7, 13, 91}

2, 3, 6, 13, 26, 39

The two proper prime factors are 7 and 13.

One has no proper factors.

No. Some proper factors are prime.

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1 doesn't have proper factors.

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The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110