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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 21 |
| 5 | 121 |
| 6 | 253 |
| 7 | 407 |
| 8 | 451 |
| 9 | 559 |
| 10 | 583 |
| 11 | 667 |
| 12 | 671 |
| 13 | 803 |
| 14 | 869 |
| 15 | 2173 |
| 16 | 2537 |
| 17 | 5063 |
| 18 | 5183 |
| 19 | 5893 |
| 20 | 10201 |
| 21 | 13231 |
| 22 | 15251 |
| 23 | 16171 |
| 24 | 18281 |
| 25 | 19291 |
| 26 | 22523 |
| 27 | 22733 |
| 28 | 24743 |
| 29 | 25283 |
| 30 | 26563 |
| 31 | 27383 |
| 32 | 28583 |
| 33 | 28783 |
| 34 | 31613 |
| 35 | 35653 |
| 36 | 37673 |
| 37 | 38683 |
| 38 | 40567 |
| 39 | 45349 |
| 40 | 46217 |
[4,6,9,21,121,253,407,451,559,583,667,671,803,869, 2173,2537,5063,5183,5893,10201,13231,15251,16171, 18281,19291,22523,22733,24743,25283,26563,27383, 28583,28783,31613,35653,37673,38683,40567,45349, 46217] |