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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 345 |
| 3 | 567 |
| 4 | 7891011 |
| 5 | 111213 |
| 6 | 1314151617 |
| 7 | 171819 |
| 8 | 1920212223 |
| 9 | 23242526272829 |
| 10 | 293031 |
| 11 | 31323334353637 |
| 12 | 3738394041 |
| 13 | 414243 |
| 14 | 4344454647 |
| 15 | 47484950515253 |
| 16 | 53545556575859 |
| 17 | 596061 |
| 18 | 61626364656667 |
| 19 | 6768697071 |
| 20 | 717273 |
| 21 | 73747576777879 |
[23,345,567,7891011,111213,1314151617,171819, 1920212223,23242526272829,293031,31323334353637, 3738394041,414243,4344454647,47484950515253, 53545556575859,596061,61626364656667,6768697071, 717273,73747576777879] |