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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 121 |
| 5 | 323 |
| 6 | 737 |
| 7 | 767 |
| 8 | 949 |
| 9 | 979 |
| 10 | 989 |
| 11 | 10201 |
| 12 | 13231 |
| 13 | 15151 |
| 14 | 15251 |
| 15 | 18281 |
| 16 | 19291 |
| 17 | 31313 |
| 18 | 31613 |
| 19 | 33233 |
| 20 | 35653 |
| 21 | 35953 |
| 22 | 36863 |
| 23 | 37073 |
| 24 | 37673 |
| 25 | 38383 |
| 26 | 38683 |
| 27 | 70307 |
| 28 | 73537 |
| 29 | 73937 |
| 30 | 74447 |
| 31 | 74947 |
| 32 | 77677 |
| 33 | 79297 |
| 34 | 79897 |
| 35 | 90109 |
| 36 | 92129 |
| 37 | 92329 |
| 38 | 92629 |
[4,6,9,121,323,737,767,949,979,989,10201,13231, 15151,15251,18281,19291,31313,31613,33233,35653, 35953,36863,37073,37673,38383,38683,70307,73537, 73937,74447,74947,77677,79297,79897,90109,92129, 92329,92629] |