n | a(n) |
---|---|
0 | 4 |
1 | 31 |
2 | 301 |
3 | 3001 |
4 | 30001 |
5 | 300001 |
6 | 3000001 |
7 | 30000001 |
8 | 300000001 |
9 | 3000000001 |
10 | 30000000001 |
11 | 300000000001 |
12 | 3000000000001 |
13 | 30000000000001 |
14 | 300000000000001 |
15 | 3000000000000001 |
16 | 30000000000000001 |
17 | 300000000000000001 |
18 | 3000000000000000001 |
[4,31,301,3001,30001,300001,3000001,30000001, 300000001,3000000001,30000000001,300000000001, 3000000000001,30000000000001,300000000000001, 3000000000000001,30000000000000001, 300000000000000001,3000000000000000001] |