| 1 |
| 2 |
| 1 |
| 3 |
| 3-2 |
| 2×3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 4 |
| 4-3 |
| 3×4 |
| 1 |
| 12 |
| 1 |
| 4 |
| 1 |
| 5 |
| 5-4 |
| 4×5 |
| 1 |
| 20 |
| 1 |
| n |
| 1 |
| n+1 |
| 1 |
| n(n+1) |
| 1 |
| n(n+1) |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 20 |
| 1 |
| 30 |
| 1 |
| 42 |

| 1 |
| 2 |
这是一根起点为0的数轴,现有同学将它弯折,如图所示,例如:虚线上第一行0,第二行6,第三行21…,第4行的数是| 输入 | … | 1 | 2 | 3 | 4 | 5 | … | ||||||||||
| 输出 | … |
|
|
|
|
|
… |
| 8 |
| 17 |
| 8 |
| 17 |
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 2007 |
| 1 |
| 2007 |
| 1 |
| 1-4 |
| 7 |
| 7-4 |
| 2 |
| 2-4 |
| 6 |
| 6-4 |
| 3 |
| 3-4 |
| 5 |
| 5-4 |
| 10 |
| 10-4 |
| -2 |
| -2-4 |
| 19 |
| 19-4 |
| m |
| m-4 |