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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 17 |
| 3 | 18 |
| 4 | 20 |
| 5 | 21 |
| 6 | 37 |
| 7 | 38 |
| 8 | 40 |
| 9 | 41 |
| 10 | 57 |
| 11 | 58 |
| 12 | 60 |
| 13 | 61 |
| 14 | 77 |
| 15 | 78 |
| 16 | 80 |
| 17 | 81 |
| 18 | 97 |
| 19 | 98 |
[1,17,18,20,21,37,38,40,41,57,58,60,61,77,78,80, 81,97,98] |