The answer to exercise marked [BB] can be found in the Back of the Book.
For any natural number n, let d(n)denote the number of positive divisors of n. For example, d(4) = 3 because 4 has three positive divisors: 1, 2, and 4.
(a) Describe those natural numbers n for which d(n) = 2.
(b) [BB] Describe those natural numbers n for which d (n)= 3.
(c) Describe those natural numbers n for which d(n) = 5.
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