n | a(n) |
---|---|
1 | 3 |
2 | 9 |
3 | 31 |
4 | 99 |
5 | 316 |
6 | 999 |
7 | 3162 |
8 | 9999 |
9 | 31622 |
10 | 99999 |
11 | 316227 |
12 | 999999 |
13 | 3162277 |
14 | 9999999 |
15 | 31622776 |
16 | 99999999 |
17 | 316227766 |
18 | 999999999 |
19 | 3162277660 |
20 | 9999999999 |
21 | 31622776601 |
22 | 99999999999 |
23 | 316227766016 |
24 | 999999999999 |
25 | 3162277660168 |
[3,9,31,99,316,999,3162,9999,31622,99999,316227, 999999,3162277,9999999,31622776,99999999, 316227766,999999999,3162277660,9999999999, 31622776601,99999999999,316227766016,999999999999, 3162277660168] |