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Why is the prime number 11 not perfect?

Updated: 8/18/2019
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13y ago

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A "perfect number" is defined to be a number such that all of its factors - smaller than the number itself - add up to the number. Examples:

6 = 1 + 2 + 3

28 = 1 + 2 + 4 + 7 + 14

11 is not equal to its only factor (smaller than itself), the number 1.

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13y ago
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Q: Why is the prime number 11 not perfect?
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