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20
The sum of 7 & 13 = 7 + 13 = 20
Sum of first 7 prime numbers is equal to 2+3+5+7+11+13+17 = 58.
The first 8 prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19. Their sum is 77.
2 and 3 for product, 5 and 13 or 7 and 11 for sum