1 | 9 | 3 * 3 |
2 | 99 | 3 * 3 * 11 |
3 | 999 | 3 * 3 * 3 * 37 |
4 | 9999 | 3 * 3 * 11 * 101 |
5 | 99999 | 3 * 3 * 41 * 271 |
6 | 999999 | 3 * 3 * 3 * 7 * 11 * 13 * 37 |
7 | 9999999 | 3 * 3 * 239 * 4649 |
8 | 99999999 | 3 * 3 * 11 * 73 * 101 * 137 |
9 | 999999999 | 3 * 3 * 3 * 3 * 37 * 333667 |
10 | 9999999999 | 3 * 3 * 11 * 41 * 271 * 9091 |
11 | 99999999999 | 3 * 3 * 21649 * 513239 |
12 | 999999999999 | 3 * 3 * 3 * 7 * 11 * 13 * 37 * 101 * 9901 |
13 | 9999999999999 | 3 * 3 * 53 * 79 * 265371653 |
14 | 99999999999999 | 3 * 3 * 11 * 239 * 4649 * 909091 |
15 | 999999999999999 | 3 * 3 * 3 * 31 * 37 * 41 * 271 * 2906161 |
16 | 9999999999999999 | 3 * 3 * 11 * 17 * 73 * 101 * 137 * 5882353 |
17 | 99999999999999999 | 3 * 3 * 2071723 * 5363222357 |
18 | 999999999999999999 | 3 * 3 * 3 * 3 * 7 * 11 * 13 * 19 * 37 * 52579 * 333667 |