n | a(n) |
---|---|
1 | 1 |
2 | 9 |
3 | 19 |
4 | 99 |
5 | 119 |
6 | 199 |
7 | 999 |
8 | 1199 |
9 | 1999 |
10 | 9999 |
11 | 19999 |
12 | 99999 |
13 | 119999 |
14 | 199999 |
15 | 999999 |
16 | 1199999 |
17 | 1999999 |
18 | 9999999 |
19 | 19999999 |
20 | 99999999 |
21 | 119999999 |
22 | 199999999 |
23 | 999999999 |
24 | 1199999999 |
25 | 1999999999 |
26 | 9999999999 |
27 | 19999999999 |
28 | 99999999999 |
29 | 119999999999 |
30 | 199999999999 |
31 | 999999999999 |
[1,9,19,99,119,199,999,1199,1999,9999,19999,99999, 119999,199999,999999,1199999,1999999,9999999, 19999999,99999999,119999999,199999999,999999999, 1199999999,1999999999,9999999999,19999999999, 99999999999,119999999999,199999999999, 999999999999] |