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perfect number

Perfect Number

A number n for which the sum of all the positiveintegerfactors of n which are less than n add up to n.

For example, 6 and 28 are perfect numbers. The number 6 has factors 1, 2, and 3, and 1 + 2 + 3 = 6. The number 28 has factors 1, 2, 4, 7, and 14, and 1 + 2 + 4 + 7 + 14 = 28.

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