Tabla del 991
| 991 | X | 1 | = | 991 |
| 991 | X | 2 | = | 1982 |
| 991 | X | 3 | = | 2973 |
| 991 | X | 4 | = | 3964 |
| 991 | X | 5 | = | 4955 |
| 991 | X | 6 | = | 5946 |
| 991 | X | 7 | = | 6937 |
| 991 | X | 8 | = | 7928 |
| 991 | X | 9 | = | 8919 |
| 991 | X | 10 | = | 9910 |
| 991 | X | 1 | = | 991 |
| 991 | X | 2 | = | 1982 |
| 991 | X | 3 | = | 2973 |
| 991 | X | 4 | = | 3964 |
| 991 | X | 5 | = | 4955 |
| 991 | X | 6 | = | 5946 |
| 991 | X | 7 | = | 6937 |
| 991 | X | 8 | = | 7928 |
| 991 | X | 9 | = | 8919 |
| 991 | X | 10 | = | 9910 |