Math puzzles!

9)163
1-20: 2 miss, 1 dart hits 1-20
21-40: 1 miss, 1 dart hits 1-20, 1 dart hits 1-20
41-60: 1 dart hits 1-20, 1 dart hits 1-20, 1 dart hits 1-20
61-80: 1 miss, 1 dart hits 1-20, 1 dart hits 3x 1-20
81-100: 1 dart hits 20, 1 dart hits 1-20, 1 dart hits 3x 20
101-120: 1 dart hits 3x 20, 1 dart hits 2x 20, 1 dart hits 1-20
121-140: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 1-20
141: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 3x 7
142: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 2x 11
143: 1 dart hits 50, 1 dart hits 3x 20, 1 dart hits 3x 11
144: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 3x 8
145: 1 dart hits 3x 15, 1 dart hits 50, 1 dart hits 50
146: 1 dart hits 3x20, 1 dart hits 3x20, 1 dart hits 2x 13
147: 1 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 3x 9
148: 1 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 2x 14
149: 1 dart hits 3x 13, 1 dart hits 50, 1 dart hits 3x 20
150: 3 darts hit 50
151: 1 dart hits 50, 1 dart hits 3x 17, 1 dart hits 50
152: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 2x 16
153: 1 dart hits 3x20, 1 dart hits 3x20, 1 dart hits 3x 11
154: 1 dart hits 3x 20, 1 dart hits 3x 20, 1 dart hits 2x 17
155: 1 dart hits 3x 20, 1 dart hits 50, 1 dart hits 3x 15
156: 1 dart hit 3x 20, 1 dart hits 3x 20, 1 dart hits 3x 12
157: 1 dart hits 50, 1 dart hits 3x 19, 1 dart hits 50
158: 1 dart hits 3x 20, 1 dart hits 50, 1 dart hits 3x 16
159: 1 dart hits 3x20, 1 dart 3x20, 1 dart hits 3x 13
160: 1 dart hits 50, 1 dart hits 50, 1 dart hits 3x 20
161: 1 dart hits 3x20, 1 dart hits 50, 1 dart hits 3x 17
162: 1 dart hits 3x20, 1 dart hits 3x20, 1 dart hits 3x 14
163: can't. You can do everything with combinations of 20 and 50s, but this one. 2 darts 3x 20s, 43 left can't be done, prime. 2x 50s, 63 left, can't be done coz there is no 21. 3x 20 + 50, 53 left can't be done, prime.