Exercises 3.6

7, 19*, 23, 25*, 29, 33*, 37, 41*, 43*, 49

Exercises 4.1

7, 25*, 27, 39*, 41, 47*, 49, 55*, 57, 59*, 63

Exercises 4.2

7, 17, 19*, 21, 25*, 27, 33