| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | -1 |
| 4 | 1001 |
| 5 | 50 |
| 6 | -1 |
| 7 | 19 |
| 8 | 24 |
| 9 | 31 |
| 10 | 34 |
| 11 | 44 |
| 12 | 54 |
| 13 | 119 |
| 14 | 124 |
| 15 | 131 |
| 16 | 134 |
| 17 | 144 |
| 18 | 154 |
| 19 | 231 |
| 20 | 234 |
| 21 | 244 |
| 22 | 254 |
| 23 | 354 |
| 24 | 444 |
| 25 | 454 |
[1,4,-1,1001,50,-1,19,24,31,34,44,54,119,124,131, 134,144,154,231,234,244,254,354,444,454] |