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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 79 |
| 3 | 89 |
| 4 | 97 |
| 5 | 787 |
| 6 | 797 |
| 7 | 877 |
| 8 | 887 |
| 9 | 977 |
| 10 | 997 |
| 11 | 7789 |
| 12 | 7877 |
| 13 | 7879 |
| 14 | 8779 |
| 15 | 8887 |
| 16 | 8999 |
| 17 | 9787 |
| 18 | 9887 |
| 19 | 77797 |
| 20 | 77899 |
| 21 | 77977 |
| 22 | 77999 |
| 23 | 78779 |
| 24 | 78787 |
| 25 | 78797 |
| 26 | 78877 |
| 27 | 78887 |
| 28 | 78889 |
| 29 | 78977 |
| 30 | 78979 |
| 31 | 78989 |
| 32 | 79777 |
| 33 | 79889 |
| 34 | 79979 |
| 35 | 79987 |
| 36 | 79997 |
| 37 | 79999 |
[7,79,89,97,787,797,877,887,977,997,7789,7877, 7879,8779,8887,8999,9787,9887,77797,77899,77977, 77999,78779,78787,78797,78877,78887,78889,78977, 78979,78989,79777,79889,79979,79987,79997,79999] |