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| n | a(n) |
|---|---|
| 1 | 89 |
| 2 | 88989899 |
| 3 | 98988899 |
| 4 | 98989889 |
| 5 | 99898889 |
| 6 | 8889899899 |
| 7 | 8889988999 |
| 8 | 8889998899 |
| 9 | 8898988999 |
| 10 | 8898989989 |
| 11 | 8899889989 |
| 12 | 8988998899 |
| 13 | 8988999889 |
| 14 | 8989889899 |
| 15 | 8989889989 |
| 16 | 8989899889 |
| 17 | 8989988899 |
| 18 | 8998998889 |
| 19 | 8999888899 |
| 20 | 9888899899 |
| 21 | 9888989899 |
| 22 | 9889898899 |
| 23 | 9889988989 |
[89,88989899,98988899,98989889,99898889, 8889899899,8889988999,8889998899,8898988999, 8898989989,8899889989,8988998899,8988999889, 8989889899,8989889989,8989899889,8989988899, 8998998889,8999888899,9888899899,9888989899, 9889898899,9889988989] |