Define a function S: Z+ → Z+ as follows: For each positive integer n, S(n) = the sum of the positive divisors of n. Find the following: a. S(1) d. S(5) b. S(15) c. S(17) f. S(21) e. S(18)

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Q: Evaluate for f(2), of the table below. Input Output -1 1 3 53474

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Q: 0-64 N

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A: Solved below