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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 223 |
| 4 | 2237 |
| 5 | 32237 |
| 6 | 3223729 |
| 7 | 63223729 |
| 8 | 632237297 |
| 9 | 2632237297 |
| 10 | 263223729721 |
| 11 | 12263223729721 |
| 12 | 1226322372972173 |
| 13 | 171226322372972173 |
| 14 | 17122632237297217381 |
| 15 | 2117122632237297217381 |
| 16 | 21171226322372972173813 |
[2,23,223,2237,32237,3223729,63223729,632237297, 2632237297,263223729721,12263223729721, 1226322372972173,171226322372972173, 17122632237297217381,2117122632237297217381, 21171226322372972173813] |