n | a(n) |
---|---|
1 | 9 |
2 | 31 |
3 | 99 |
4 | 998 |
5 | 999 |
6 | 7937 |
7 | 9999 |
8 | 99998 |
9 | 99999 |
10 | 996999 |
11 | 999999 |
12 | 6688699 |
13 | 9999999 |
14 | 97609999 |
15 | 99969999 |
16 | 999999998 |
17 | 999899999 |
18 | 9998999999 |
19 | 9999999999 |
20 | 9999699999 |
21 | 99999989999 |
22 | 99998999999 |
23 | 997999998999 |
[9,31,99,998,999,7937,9999,99998,99999,996999, 999999,6688699,9999999,97609999,99969999, 999999998,999899999,9998999999,9999999999, 9999699999,99999989999,99998999999,997999998999] |