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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 25 |
| 5 | 26 |
| 6 | 35 |
| 7 | 38 |
| 8 | 39 |
| 9 | 49 |
| 10 | 58 |
| 11 | 69 |
| 12 | 87 |
| 13 | 249 |
| 14 | 259 |
| 15 | 278 |
| 16 | 289 |
| 17 | 299 |
| 18 | 398 |
| 19 | 478 |
| 20 | 489 |
| 21 | 579 |
| 22 | 589 |
| 23 | 679 |
| 24 | 689 |
| 25 | 699 |
| 26 | 789 |
| 27 | 799 |
| 28 | 889 |
| 29 | 899 |
| 30 | 2589 |
| 31 | 2599 |
| 32 | 2779 |
| 33 | 2798 |
| 34 | 2899 |
| 35 | 3799 |
| 36 | 3898 |
| 37 | 3899 |
| 38 | 4798 |
| 39 | 4979 |
| 40 | 4989 |
| 41 | 5799 |
| 42 | 5899 |
| 43 | 5999 |
| 44 | 6989 |
| 45 | 6999 |
| 46 | 7899 |
| 47 | 7999 |
| 48 | 8899 |
| 49 | 9899 |
| 50 | 19999 |
| 51 | 26799 |
[4,6,9,25,26,35,38,39,49,58,69,87,249,259,278,289, 299,398,478,489,579,589,679,689,699,789,799,889, 899,2589,2599,2779,2798,2899,3799,3898,3899,4798, 4979,4989,5799,5899,5999,6989,6999,7899,7999,8899, 9899,19999,26799] |