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| n | a(n) |
|---|---|
| 1 | 684 |
| 2 | 6684 |
| 3 | 8874 |
| 4 | 66684 |
| 5 | 68474 |
| 6 | 74758 |
| 7 | 76478 |
| 8 | 86478 |
| 9 | 666684 |
| 10 | 668474 |
| 11 | 675684 |
| 12 | 744758 |
| 13 | 766458 |
| 14 | 6666684 |
| 15 | 6668474 |
| 16 | 6675684 |
| 17 | 6748678 |
| 18 | 6845784 |
| 19 | 7586478 |
| 20 | 8686574 |
| 21 | 8875684 |
| 22 | 66666684 |
| 23 | 66756684 |
| 24 | 74744758 |
| 25 | 74758576 |
| 26 | 75858874 |
| 27 | 75867574 |
| 28 | 76464878 |
| 29 | 86878458 |
| 30 | 87546878 |
[684,6684,8874,66684,68474,74758,76478,86478, 666684,668474,675684,744758,766458,6666684, 6668474,6675684,6748678,6845784,7586478,8686574, 8875684,66666684,66756684,74744758,74758576, 75858874,75867574,76464878,86878458,87546878] |