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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 8 |
| 4 | 48 |
| 5 | 84 |
| 6 | 444 |
| 7 | 446 |
| 8 | 464 |
| 9 | 488 |
| 10 | 648 |
| 11 | 666 |
| 12 | 668 |
| 13 | 684 |
| 14 | 686 |
| 15 | 848 |
| 16 | 866 |
| 17 | 884 |
| 18 | 888 |
| 19 | 4448 |
| 20 | 4466 |
| 21 | 4484 |
| 22 | 4646 |
| 23 | 4664 |
| 24 | 4844 |
| 25 | 6444 |
| 26 | 6446 |
| 27 | 6464 |
| 28 | 6468 |
| 29 | 6486 |
| 30 | 6644 |
| 31 | 6648 |
| 32 | 6666 |
| 33 | 6684 |
| 34 | 6846 |
| 35 | 6864 |
| 36 | 6888 |
| 37 | 8444 |
| 38 | 8448 |
| 39 | 8466 |
| 40 | 8484 |
| 41 | 8646 |
| 42 | 8664 |
| 43 | 8688 |
| 44 | 8844 |
| 45 | 8868 |
| 46 | 8886 |
| 47 | 44444 |
[4,6,8,48,84,444,446,464,488,648,666,668,684,686, 848,866,884,888,4448,4466,4484,4646,4664,4844, 6444,6446,6464,6468,6486,6644,6648,6666,6684,6846, 6864,6888,8444,8448,8466,8484,8646,8664,8688,8844, 8868,8886,44444] |