The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 99 |
| 3 | 741 |
| 4 | 979 |
| 5 | 999 |
| 6 | 9499 |
| 7 | 9999 |
| 8 | 99999 |
| 9 | 319999 |
| 10 | 749509 |
| 11 | 771999 |
| 12 | 999999 |
| 13 | 1240099 |
| 14 | 3522999 |
| 15 | 3794109 |
| 16 | 7099999 |
| 17 | 7425741 |
| 18 | 9801979 |
| 19 | 9998899 |
| 20 | 9999999 |
| 21 | 10870209 |
| 22 | 19789119 |
| 23 | 30099999 |
| 24 | 73378209 |
| 25 | 75199999 |
| 26 | 99999999 |
| 27 | 326599999 |
| 28 | 726199999 |
| 29 | 728739999 |
| 30 | 783742161 |
| 31 | 969999999 |
[9,99,741,979,999,9499,9999,99999,319999,749509, 771999,999999,1240099,3522999,3794109,7099999, 7425741,9801979,9998899,9999999,10870209,19789119, 30099999,73378209,75199999,99999999,326599999, 726199999,728739999,783742161,969999999] |