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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 17 |
| 3 | 37 |
| 4 | 47 |
| 5 | 67 |
| 6 | 97 |
| 7 | 227 |
| 8 | 337 |
| 9 | 557 |
| 10 | 887 |
| 11 | 997 |
| 12 | 1117 |
| 13 | 4447 |
| 14 | 5557 |
| 15 | 8887 |
| 16 | 11117 |
| 17 | 333337 |
| 18 | 555557 |
| 19 | 666667 |
| 20 | 888887 |
| 21 | 11111117 |
| 22 | 66666667 |
| 23 | 222222227 |
| 24 | 666666667 |
| 25 | 888888887 |
| 26 | 4444444447 |
| 27 | 5555555557 |
| 28 | 66666666667 |
| 29 | 888888888887 |
| 30 | 222222222222227 |
[7,17,37,47,67,97,227,337,557,887,997,1117,4447, 5557,8887,11117,333337,555557,666667,888887, 11111117,66666667,222222227,666666667,888888887, 4444444447,5555555557,66666666667,888888888887, 222222222222227] |