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| n | a(n) |
|---|---|
| 1 | 47 |
| 2 | 74 |
| 3 | 147 |
| 4 | 174 |
| 5 | 247 |
| 6 | 274 |
| 7 | 347 |
| 8 | 374 |
| 9 | 447 |
| 10 | 470 |
| 11 | 547 |
| 12 | 574 |
| 13 | 647 |
| 14 | 674 |
| 15 | 740 |
| 16 | 774 |
| 17 | 847 |
| 18 | 874 |
| 19 | 947 |
| 20 | 974 |
| 21 | 1047 |
| 22 | 1074 |
| 23 | 1147 |
| 24 | 1174 |
| 25 | 1247 |
| 26 | 1274 |
| 27 | 1347 |
| 28 | 1374 |
| 29 | 1447 |
| 30 | 1470 |
| 31 | 1547 |
| 32 | 1574 |
| 33 | 1647 |
| 34 | 1674 |
| 35 | 1740 |
| 36 | 1774 |
| 37 | 1847 |
| 38 | 1874 |
| 39 | 1947 |
| 40 | 1974 |
| 41 | 2047 |
[47,74,147,174,247,274,347,374,447,470,547,574, 647,674,740,774,847,874,947,974,1047,1074,1147, 1174,1247,1274,1347,1374,1447,1470,1547,1574,1647, 1674,1740,1774,1847,1874,1947,1974,2047] |