15 and 2
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It is: 13+17 = 30
17/30 is in lowest reduced terms because 17 and 30 are coprime- that is, the only factor they share is 1. This is because 17 is already prime, and 17 is not a factor of 30.
5 and 6 is the factor pair for 5 x 6 equals 30
The sum of divisors of a number, excluding the number itself, is called its aliquot sum
30 plus 30 equals 60 and 60 minus 38 equals 22