| n | a(n) |
|---|---|
| 1 | 3135313 |
| 2 | 3732373 |
| 3 | 3836383 |
| 4 | 7276727 |
| 5 | 7278727 |
| 6 | 7576757 |
| 7 | 7873787 |
| 8 | 7977797 |
| 9 | 11311511311 |
| 10 | 11411311411 |
| 11 | 13331113331 |
| 12 | 13331713331 |
| 13 | 13831913831 |
| 14 | 13931413931 |
| 15 | 17471317471 |
| 16 | 19391319391 |
| 17 | 31513531513 |
| 18 | 31513831513 |
| 19 | 31513931513 |
| 20 | 37273937273 |
| 21 | 37573237573 |
| 22 | 37573337573 |
[3135313,3732373,3836383,7276727,7278727,7576757, 7873787,7977797,11311511311,11411311411, 13331113331,13331713331,13831913831,13931413931, 17471317471,19391319391,31513531513,31513831513, 31513931513,37273937273,37573237573,37573337573] |