The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 44 |
| 4 | 888 |
| 5 | 5555 |
| 6 | 88888 |
| 7 | 1111111 |
| 8 | 2222222 |
| 9 | 22222222 |
| 10 | 77777777 |
| 11 | 1111111111 |
| 12 | 7777777777 |
| 13 | 22222222222 |
| 14 | 44444444444 |
| 15 | 444444444444 |
| 16 | 1111111111111 |
| 17 | 4444444444444 |
| 18 | 7777777777777 |
| 19 | 999999999999999 |
| 20 | 7777777777777777 |
| 21 | 22222222222222222 |
| 22 | 77777777777777777 |
[1,7,44,888,5555,88888,1111111,2222222,22222222, 77777777,1111111111,7777777777,22222222222, 44444444444,444444444444,1111111111111, 4444444444444,7777777777777,999999999999999, 7777777777777777,22222222222222222, 77777777777777777] |