Chapter 2

2.1:    3
2.2:    5, 7, 9, 15, 17, 21, 23, 25, 27
2.3:    1-28(odd), 33, 37, 38, 39, 43, 45(a,b)
2.4:    1, 15, 21
2.5:    3, 13, 17, 19, 31, 33, 37, 39, 45
2.6:    3, 9, 11, 15, 17, 19, 21, 23, 31, 51
2.7:    3, 7, 11, 19
2.8:    3, 4, 13, 15, 19, 21
2.9:    1, 3, 19, 21, 23