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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 15 |
| 3 | 21 |
| 4 | 33 |
| 5 | 39 |
| 6 | 57 |
| 7 | 105 |
| 8 | 129 |
| 9 | 147 |
| 10 | 159 |
| 11 | 183 |
| 12 | 231 |
| 13 | 237 |
| 14 | 273 |
| 15 | 303 |
| 16 | 399 |
| 17 | 501 |
| 18 | 633 |
| 19 | 735 |
| 20 | 903 |
| 21 | 1029 |
| 22 | 1041 |
| 23 | 1083 |
| 24 | 1113 |
[3,15,21,33,39,57,105,129,147,159,183,231,237,273, 303,399,501,633,735,903,1029,1041,1083,1113] |