2.1 - p 178 # 1 - 6 all, #7 just quadrant, #11, 17, 23, 29

2.3 - p 206 # 11,15,21,29,31,43,49,53,57,63,75,81,85,96

2.4 - p 214 # 1, 9, 17, 19, 25, 31, 37, 43, 47, 51