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a, ar, ar^2 and ar^3 where a and r are constants.
Assuming the first five numbers is meant to refer, not to the first five real numbers but to the first five positive integers, the answer is 1*2*3*4*5 = 120
The first five prime numbers are 2, 3, 5, 7, 11. The sum of these five numbers is 28.
Nine has three factors.
They are: 2 3 5 7 and 11