Section Exercises 1.1 1, 3, 11, 13, 17, 21, 27, 31, 49, 51, 55 1.2 1, 5, 13, 19, 21, 25, 29, 33, 37, 41, 43 1.3 3, 7, 13, 19, 25, 31, 33, 37, 41 1.4 1, 3, 5, 9, 11, 21, 31, 37, 41 1.5 1, 3, 5, 7, 13, 19, 25, 27, 33, 37, 51 1.6 1, 5, 9, 11, 17, 21, 25, 33 2.1 1, 3, 5, 9, 13, 15, 17, 19, 21 2.2 1-13 odd, 17, 19, 21, 25, 29, 33, 43, 45 2.3 7, 9, 13, 17, 23, 25, 29 2.4 1, 5, 9, 13, 25, 29 2.5 1, 3, 7, 11, 15, 17, 19, 25, 27, 33, 43, 45 2.7 1, 3, 7, 13, 15, 17, 19, 21, 25 3.1 1, 3, 5, 9, 15, 19, 27, 33, 35 3.2 1, 3, 9, 13, 19, 27, 31 3.3 1, 5, 9, 17, 19, 25, 29 3.4 3, 5, 9, 17, 23, 27, 29 3.5 1, 3, 13 4.1 1, 3, 9, 13, 17, 29, 31, 35, 37 4.2 3, 5, 7, 11, 19 4.3 1, 3, 5, 9, 11, 15, 27, 29, 31, 37, 39, 47 4.4 1-19 odd, 49, 57 4.5 1, 3, 7, 11, 21, 27, 35 5.1 1, 5, 9, 11, 39, 43, 45 5.2 1, 5, 9, 15 5.3 3, 5, 9, 11, 23, 29, 33, 35 5.4 1, 5