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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 63 |
| 3 | 66 |
| 4 | 75 |
| 5 | 189 |
| 6 | 198 |
| 7 | 201 |
| 8 | 225 |
| 9 | 228 |
| 10 | 237 |
| 11 | 567 |
| 12 | 588 |
| 13 | 594 |
| 14 | 603 |
| 15 | 606 |
| 16 | 675 |
| 17 | 684 |
| 18 | 687 |
| 19 | 711 |
| 20 | 714 |
| 21 | 723 |
| 22 | 1701 |
| 23 | 1722 |
| 24 | 1764 |
| 25 | 1767 |
| 26 | 1776 |
| 27 | 1782 |
| 28 | 1803 |
| 29 | 1809 |
| 30 | 1818 |
| 31 | 1821 |
| 32 | 2025 |
| 33 | 2046 |
| 34 | 2052 |
| 35 | 2061 |
| 36 | 2064 |
| 37 | 2133 |
| 38 | 2142 |
| 39 | 2145 |
| 40 | 2169 |
| 41 | 2172 |
| 42 | 2181 |
[21,63,66,75,189,198,201,225,228,237,567,588,594, 603,606,675,684,687,711,714,723,1701,1722,1764, 1767,1776,1782,1803,1809,1818,1821,2025,2046,2052, 2061,2064,2133,2142,2145,2169,2172,2181] |