n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 4 |
5 | 5 |
6 | 6 |
7 | 7 |
8 | 9 |
9 | 99 |
10 | 999 |
11 | 9999 |
12 | 99999 |
13 | 999999 |
14 | 9999999 |
15 | 99999999 |
16 | 999999999 |
17 | 9999999999 |
18 | 99999999999 |
19 | 999999999999 |
20 | 9999999999999 |
21 | 99999999999999 |
22 | 999999999999999 |
23 | 9999999999999999 |
24 | 99999999999999999 |
[1,2,3,4,5,6,7,9,99,999,9999,99999,999999,9999999, 99999999,999999999,9999999999,99999999999, 999999999999,9999999999999,99999999999999, 999999999999999,9999999999999999, 99999999999999999] |