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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 3 |
| 3 | 45 |
| 4 | 67 |
| 5 | 891011 |
| 6 | 1213 |
| 7 | 14151617 |
| 8 | 1819 |
| 9 | 20212223 |
| 10 | 242526272829 |
| 11 | 3031 |
| 12 | 323334353637 |
| 13 | 38394041 |
| 14 | 4243 |
| 15 | 44454647 |
| 16 | 484950515253 |
| 17 | 545556575859 |
| 18 | 6061 |
| 19 | 626364656667 |
| 20 | 68697071 |
| 21 | 7273 |
| 22 | 747576777879 |
| 23 | 80818283 |
| 24 | 848586878889 |
| 25 | 9091929394959697 |
| 26 | 9899100101 |
| 27 | 102103 |
[12,3,45,67,891011,1213,14151617,1819,20212223, 242526272829,3031,323334353637,38394041,4243, 44454647,484950515253,545556575859,6061, 626364656667,68697071,7273,747576777879,80818283, 848586878889,9091929394959697,9899100101,102103] |