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| n | a(n) |
|---|---|
| 1 | 2899999989 |
| 2 | 2989999899 |
| 3 | 2999889999 |
| 4 | 3799999899 |
| 5 | 3898989999 |
| 6 | 3899799999 |
| 7 | 3899999988 |
| 8 | 3979989999 |
| 9 | 3988899999 |
| 10 | 3989999898 |
| 11 | 3989999979 |
| 12 | 3998999889 |
| 13 | 3999889998 |
| 14 | 3999898989 |
| 15 | 3999899799 |
| 16 | 3999979989 |
| 17 | 3999988899 |
| 18 | 4699998999 |
[2899999989,2989999899,2999889999,3799999899, 3898989999,3899799999,3899999988,3979989999, 3988899999,3989999898,3989999979,3998999889, 3999889998,3999898989,3999899799,3999979989, 3999988899,4699998999] |