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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 44 |
| 3 | 45 |
| 4 | 46 |
| 5 | 47 |
| 6 | 48 |
| 7 | 49 |
| 8 | 54 |
| 9 | 64 |
| 10 | 74 |
| 11 | 84 |
| 12 | 94 |
| 13 | 444 |
| 14 | 445 |
| 15 | 446 |
| 16 | 447 |
| 17 | 448 |
| 18 | 449 |
| 19 | 454 |
| 20 | 455 |
| 21 | 456 |
| 22 | 457 |
| 23 | 458 |
| 24 | 459 |
| 25 | 464 |
| 26 | 465 |
| 27 | 466 |
| 28 | 467 |
| 29 | 468 |
| 30 | 469 |
| 31 | 474 |
| 32 | 475 |
| 33 | 476 |
| 34 | 477 |
| 35 | 478 |
| 36 | 479 |
| 37 | 484 |
| 38 | 485 |
| 39 | 486 |
| 40 | 487 |
| 41 | 488 |
| 42 | 489 |
| 43 | 494 |
| 44 | 495 |
| 45 | 496 |
| 46 | 497 |
| 47 | 498 |
| 48 | 499 |
| 49 | 544 |
| 50 | 545 |
| 51 | 546 |
| 52 | 547 |
| 53 | 548 |
| 54 | 549 |
| 55 | 554 |
[4,44,45,46,47,48,49,54,64,74,84,94,444,445,446, 447,448,449,454,455,456,457,458,459,464,465,466, 467,468,469,474,475,476,477,478,479,484,485,486, 487,488,489,494,495,496,497,498,499,544,545,546, 547,548,549,554] |