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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 19 |
| 3 | 199 |
| 4 | 219 |
| 5 | 399 |
| 6 | 419 |
| 7 | 599 |
| 8 | 619 |
| 9 | 799 |
| 10 | 819 |
| 11 | 999 |
| 12 | 19019 |
| 13 | 21199 |
| 14 | 39219 |
| 15 | 41399 |
| 16 | 59419 |
| 17 | 61599 |
| 18 | 79619 |
| 19 | 81799 |
| 20 | 99819 |
| 21 | 1901999 |
| 22 | 2118019 |
| 23 | 3922199 |
| 24 | 4138219 |
| 25 | 5942399 |
| 26 | 6158419 |
| 27 | 7962599 |
| 28 | 8178619 |
| 29 | 9982799 |
| 30 | 190198819 |
| 31 | 211802999 |
| 32 | 392217019 |
| 33 | 413823199 |
| 34 | 594237219 |
| 35 | 615843399 |
| 36 | 796257419 |
| 37 | 817863599 |
| 38 | 998277619 |
| 39 | 19019883799 |
[-1,19,199,219,399,419,599,619,799,819,999,19019, 21199,39219,41399,59419,61599,79619,81799,99819, 1901999,2118019,3922199,4138219,5942399,6158419, 7962599,8178619,9982799,190198819,211802999, 392217019,413823199,594237219,615843399,796257419, 817863599,998277619,19019883799] |