| 81 | X | 1 | = | 81 |
| 81 | X | 2 | = | 162 |
| 81 | X | 3 | = | 243 |
| 81 | X | 4 | = | 324 |
| 81 | X | 5 | = | 405 |
| 81 | X | 6 | = | 486 |
| 81 | X | 7 | = | 567 |
| 81 | X | 8 | = | 648 |
| 81 | X | 9 | = | 729 |
| 81 | X | 10 | = | 810 |
| 81 | X | 11 | = | 891 |
| 81 | X | 12 | = | 972 |
| 81 | X | 13 | = | 1053 |
| 81 | X | 14 | = | 1134 |
| 81 | X | 15 | = | 1215 |
| 81 | X | 16 | = | 1296 |
| 81 | X | 17 | = | 1377 |
| 81 | X | 18 | = | 1458 |
| 81 | X | 19 | = | 1539 |
| 81 | X | 20 | = | 1620 |