n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 7 |
3 | 19 |
4 | 49 |
5 | 79 |
6 | 199 |
7 | 499 |
8 | 799 |
9 | 1999 |
10 | 4999 |
11 | 7999 |
12 | 19999 |
13 | 49999 |
14 | 79999 |
15 | 199999 |
16 | 499999 |
17 | 799999 |
18 | 1999999 |
19 | 4999999 |
20 | 7999999 |
21 | 19999999 |
22 | 49999999 |
23 | 79999999 |
24 | 199999999 |
25 | 499999999 |
26 | 799999999 |
27 | 1999999999 |
28 | 4999999999 |
29 | 7999999999 |
[1,4,7,19,49,79,199,499,799,1999,4999,7999,19999, 49999,79999,199999,499999,799999,1999999,4999999, 7999999,19999999,49999999,79999999,199999999, 499999999,799999999,1999999999,4999999999, 7999999999] |