The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 99 |
| 3 | 1999 |
| 4 | 19999 |
| 5 | 199999 |
| 6 | 2999999 |
| 7 | 29999999 |
| 8 | 299999999 |
| 9 | 2999999999 |
| 10 | 29999999999 |
| 11 | 299999999999 |
| 12 | 2999999999999 |
| 13 | 29999999999999 |
[99,1999,19999,199999,2999999,29999999,299999999, 2999999999,29999999999,299999999999,2999999999999, 29999999999999] |