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Problem  89
Sum of perfect numbers

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A perfect number is a number that is equal to the sum of its proper divisors. For example, 6 is perfect since 6 = 1 + 2 + 3.

What is the sum of the digits of the sum of the first 6 perfect numbers ending in 6 (you already see one of them!)?


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Date added
2009-09-29
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