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| n | a(n) |
|---|---|
| 1 | 2357 |
| 2 | 1123456789 |
| 3 | 1012233445566778899 |
| 4 | 10011222333444555666777888999 |
| 5 | 1000111222233334444555666777788889999 |
| 6 | 100001111222233333444445555566666777778888899999 |
| 7 | 100000111112222233333344444555556666677777788888999999 |
[2357,1123456789,1012233445566778899, 10011222333444555666777888999, 1000111222233334444555666777788889999, 100001111222233333444445555566666777778888899999, 10000011111222223333334444455555666667777778888899\ 9999] |