8 and 5
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Add them up. The factors of 9 are 1, 3 and 9. The sum of the factors is 13.
The factors of 9 are 1, 3, and 9. 1 + 3 + 9 = 13
The factors of 21 that add up to 8 are 1 and 7.
2 3 5 7 11 13 17 19 23 29 31 and 37 are the prime numbers you can use. Possible options are: 3 + 37 = 40 11 + 29 = 40 2 + 7 + 31 = 40 3 + 7 + 13 + 17 = 40 17 + 23 = 40 3 + 7 + 13 + 17 = 40