| 21 | x | 1 | = | 21 |
| 21 | x | 2 | = | 42 |
| 21 | x | 3 | = | 63 |
| 21 | x | 4 | = | 84 |
| 21 | x | 5 | = | 105 |
| 21 | x | 6 | = | 126 |
| 21 | x | 7 | = | 147 |
| 21 | x | 8 | = | 168 |
| 21 | x | 9 | = | 189 |
| 21 | x | 10 | = | 210 |
| 21 | x | 11 | = | 231 |
| 21 | x | 12 | = | 252 |
| 21 | x | 13 | = | 273 |
| 21 | x | 14 | = | 294 |
| 21 | x | 15 | = | 315 |
| 21 | x | 16 | = | 336 |
| 21 | x | 17 | = | 357 |
| 21 | x | 18 | = | 378 |
| 21 | x | 19 | = | 399 |
| 21 | x | 20 | = | 420 |
| 21 | x | 21 | = | 441 |
| 21 | x | 22 | = | 462 |
| 21 | x | 23 | = | 483 |
| 21 | x | 24 | = | 504 |
| 21 | x | 25 | = | 525 |
| 21 | x | 26 | = | 546 |
| 21 | x | 27 | = | 567 |
| 21 | x | 28 | = | 588 |
| 21 | x | 29 | = | 609 |
| 21 | x | 30 | = | 630 |
| 21 | x | 31 | = | 651 |
| 21 | x | 32 | = | 672 |
| 21 | x | 33 | = | 693 |
| 21 | x | 34 | = | 714 |
| 21 | x | 35 | = | 735 |
| 21 | x | 36 | = | 756 |
| 21 | x | 37 | = | 777 |
| 21 | x | 38 | = | 798 |
| 21 | x | 39 | = | 819 |
| 21 | x | 40 | = | 840 |