1 5 * 1 = 5
2 25 * 3 = 75
3 125 * 3 = 375
4 625 * 15 = 9375
5 3125 * 19 = 59375
6 15625 * 23 = 359375
7 78125 * 43 = 3359375
8 390625 * 239 = 93359375
9 1953125 * 99 = 193359375
10 9765625 * 327 = 3193359375
11 48828125 * 1499 = 73193359375
12 244140625 * 3167 = 773193359375
13 1220703125 * 3091 = 3773193359375
14 6103515625 * 12087 = 73773193359375
15 30517578125 * 25355 = 773773193359375
ふむ