What is the sum of the prime factors of ?
Source: 2017 Duke Math Meet Team Round #3
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1 0 0 0 0 2 7 = 7 × 1 9 × 7 3 × 1 0 3
We get the summation 7 + 1 9 + 7 3 + 1 0 3 = 2 0 2