Page 408, Exercise 2

(a) If D is a prime number in the range of [10, 20], then D must be 11, 13, 17, or 19. We can test the hash function with each of these.

(b) if D is of the form 2^k where k = 1 to 5, then D must be either 17 or 19 (k = 4 == 16).