| 1 |
| mn |
| 1 |
| (m+1)(n+1) |
| 1 |
| (m+2)(n+2) |
| 1 |
| (m+2009)(n+2009) |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 3000×3001 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3000 |
| 1 |
| 3001 |
| 1 |
| 3001 |
| 3000 |
| 3001 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 3000×3001 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3000 |
| 1 |
| 3001 |
| 1 |
| 3001 |
| 3000 |
| 3001 |
| 1999×1999-1999 |
| 1998×1998+1998 |
| 2000×2000-2000 |
| 1999×1999+1999 |
| 2001×2001-2001 |
| 2000×2000+2000 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |