n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 6 |
3 | 9 |
4 | 39 |
5 | 69 |
6 | 99 |
7 | 399 |
8 | 699 |
9 | 999 |
10 | 3999 |
11 | 6999 |
12 | 9999 |
13 | 39999 |
14 | 69999 |
15 | 99999 |
16 | 399999 |
17 | 699999 |
18 | 999999 |
19 | 3999999 |
20 | 6999999 |
21 | 9999999 |
22 | 39999999 |
23 | 69999999 |
24 | 99999999 |
25 | 399999999 |
26 | 699999999 |
27 | 999999999 |
28 | 3999999999 |
29 | 6999999999 |
30 | 9999999999 |
31 | 39999999999 |
32 | 69999999999 |
[0,3,6,9,39,69,99,399,699,999,3999,6999,9999, 39999,69999,99999,399999,699999,999999,3999999, 6999999,9999999,39999999,69999999,99999999, 399999999,699999999,999999999,3999999999, 6999999999,9999999999,39999999999,69999999999] |