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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 46 |
| 5 | 49 |
| 6 | 69 |
| 7 | 94 |
| 8 | 446 |
| 9 | 466 |
| 10 | 469 |
| 11 | 649 |
| 12 | 669 |
| 13 | 694 |
| 14 | 699 |
| 15 | 949 |
| 16 | 4449 |
| 17 | 4469 |
| 18 | 4499 |
| 19 | 4666 |
| 20 | 4694 |
| 21 | 4699 |
| 22 | 4946 |
| 23 | 6499 |
| 24 | 6646 |
| 25 | 6649 |
| 26 | 6694 |
| 27 | 6999 |
| 28 | 9446 |
| 29 | 9449 |
| 30 | 9466 |
| 31 | 9469 |
| 32 | 9946 |
| 33 | 9969 |
| 34 | 44494 |
| 35 | 44669 |
| 36 | 44949 |
| 37 | 44966 |
| 38 | 44969 |
| 39 | 44999 |
| 40 | 46469 |
| 41 | 46666 |
| 42 | 46946 |
| 43 | 46969 |
| 44 | 46994 |
[4,6,9,46,49,69,94,446,466,469,649,669,694,699, 949,4449,4469,4499,4666,4694,4699,4946,6499,6646, 6649,6694,6999,9446,9449,9466,9469,9946,9969, 44494,44669,44949,44966,44969,44999,46469,46666, 46946,46969,46994] |