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Section Problems 2.1 1, 3, 7, 11, 13, 21, 35, 37, 41, 45 2.2 1, 5, 7, 9, 13,17, 25,29,61, 69 2.3 9,11,13,15,19,21 2.4 1,5,7,9,13,21,27,31, 33 2.5 5, 13, 19, 29, 35, 37 41, 45 2.6 1, 5, 15, 19, 27, 31, 35, 53 2.7 1, 3, 13, 23, 27 2.8 3, 5, 11, 13, 17, 27, 31, 33 2.9 1, 5, 13, 17, 23, 31, 37, 55, 57 3.1 7,11, 27, 29 3.6 1,5,7, 17, 21,23, 37 4.1 3, 7, 11, 13 21, 27, 35, 37 4.2 1, 3, 5, 7, 9, 23, 24 4.3 1, 3, 7, 9, 13, 17, 23, 27, 33, 35, 37, 41 4.4 1,9, 21, 27, 31, 37 4.5 5, 13, 21, 25 5.1 5, 7, 9, 13, 19, 23, 25, 33, 41 5.2 5, 9, 14, 19, 25, 29, 59, 63 5.3 3, 9, 13, 17 5.4 1,3, 11, 21 7.1 3, 13, 33, 53, 7.2 7, 9, 29, 37 7.4 1, 3, 5, 9, 13, 15, 21, 23, 29, 35 C2.1 1, 3, 5, 7 C2.2 7, 9, 11, 17 C2.3 1,3, 9, 11, 13, 15, 29 C2.6 3, 7, 9, 15, 17, C2.7 1, 5, 7, 9a, 15, 17, 23 C2.8 1,5, 7, 9, 11, 21