| 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
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 |