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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 123 |
| 3 | 223 |
| 4 | 239 |
| 5 | 323 |
| 6 | 423 |
| 7 | 523 |
| 8 | 623 |
| 9 | 723 |
| 10 | 823 |
| 11 | 923 |
| 12 | 1023 |
| 13 | 1123 |
| 14 | 1223 |
| 15 | 1239 |
| 16 | 1323 |
| 17 | 1423 |
| 18 | 1523 |
| 19 | 1623 |
| 20 | 1723 |
| 21 | 1823 |
| 22 | 1923 |
| 23 | 2023 |
| 24 | 2123 |
| 25 | 2223 |
| 26 | 2239 |
| 27 | 2399 |
| 28 | 2423 |
| 29 | 2523 |
| 30 | 2623 |
| 31 | 2723 |
| 32 | 2823 |
| 33 | 2923 |
| 34 | 3023 |
| 35 | 3123 |
| 36 | 3223 |
| 37 | 3239 |
| 38 | 3323 |
| 39 | 3423 |
[23,123,223,239,323,423,523,623,723,823,923,1023, 1123,1223,1239,1323,1423,1523,1623,1723,1823,1923, 2023,2123,2223,2239,2399,2423,2523,2623,2723,2823, 2923,3023,3123,3223,3239,3323,3423] |