n | a(n) |
---|---|
0 | 3 |
1 | 39 |
2 | 399 |
3 | 3999 |
4 | 39999 |
5 | 399999 |
6 | 3999999 |
7 | 39999999 |
8 | 399999999 |
9 | 3999999999 |
10 | 39999999999 |
11 | 399999999999 |
12 | 3999999999999 |
13 | 39999999999999 |
14 | 399999999999999 |
15 | 3999999999999999 |
16 | 39999999999999999 |
17 | 399999999999999999 |
18 | 3999999999999999999 |
19 | 39999999999999999999 |
20 | 399999999999999999999 |
[3,39,399,3999,39999,399999,3999999,39999999, 399999999,3999999999,39999999999,399999999999, 3999999999999,39999999999999,399999999999999, 3999999999999999,39999999999999999, 399999999999999999,3999999999999999999, 39999999999999999999,399999999999999999999] |