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| n | a(n) |
|---|---|
| 1 | 17 |
| 2 | 71 |
| 3 | 1177 |
| 4 | 1717 |
| 5 | 1771 |
| 6 | 7117 |
| 7 | 7171 |
| 8 | 7711 |
| 9 | 111777 |
| 10 | 117177 |
| 11 | 117717 |
| 12 | 117771 |
| 13 | 171177 |
| 14 | 171717 |
| 15 | 171771 |
| 16 | 177117 |
| 17 | 177171 |
| 18 | 177711 |
| 19 | 711177 |
| 20 | 711717 |
| 21 | 711771 |
| 22 | 717117 |
| 23 | 717171 |
| 24 | 717711 |
| 25 | 771117 |
| 26 | 771171 |
| 27 | 771711 |
| 28 | 777111 |
[17,71,1177,1717,1771,7117,7171,7711,111777, 117177,117717,117771,171177,171717,171771,177117, 177171,177711,711177,711717,711771,717117,717171, 717711,771117,771171,771711,777111] |