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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 23 |
| 3 | 2311 |
| 4 | 231131 |
| 5 | 23113147 |
| 6 | 23113147229 |
| 7 | 23113147229251 |
| 8 | 23113147229251577 |
| 9 | 23113147229251577857 |
| 10 | 23113147229251577857859 |
| 11 | 23113147229251577857859911 |
| 12 | 231131472292515778578599111123 |
| 13 | 2311314722925157785785991111231223 |
[2,23,2311,231131,23113147,23113147229, 23113147229251,23113147229251577, 23113147229251577857,23113147229251577857859, 23113147229251577857859911, 231131472292515778578599111123, 2311314722925157785785991111231223] |