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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 50 |
| 4 | 55 |
| 5 | 500 |
| 6 | 505 |
| 7 | 550 |
| 8 | 555 |
| 9 | 5000 |
| 10 | 5005 |
| 11 | 5050 |
| 12 | 5055 |
| 13 | 5500 |
| 14 | 5505 |
| 15 | 5550 |
| 16 | 5555 |
| 17 | 50000 |
| 18 | 50005 |
| 19 | 50050 |
| 20 | 50055 |
| 21 | 50500 |
| 22 | 50505 |
| 23 | 50550 |
| 24 | 50555 |
| 25 | 55000 |
| 26 | 55005 |
| 27 | 55050 |
| 28 | 55055 |
| 29 | 55500 |
| 30 | 55505 |
| 31 | 55550 |
| 32 | 55555 |
| 33 | 500000 |
| 34 | 500005 |
| 35 | 500050 |
| 36 | 500055 |
| 37 | 500500 |
| 38 | 500505 |
| 39 | 500550 |
| 40 | 500555 |
[0,5,50,55,500,505,550,555,5000,5005,5050,5055, 5500,5505,5550,5555,50000,50005,50050,50055,50500, 50505,50550,50555,55000,55005,55050,55055,55500, 55505,55550,55555,500000,500005,500050,500055, 500500,500505,500550,500555] |