The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 71 |
| 3 | 751 |
| 4 | 9721 |
| 5 | 79531 |
| 6 | 978521 |
| 7 | 7979771 |
| 8 | 97979771 |
| 9 | 997979371 |
| 10 | 9997979371 |
| 11 | 79997979521 |
| 12 | 979997978551 |
| 13 | 7979997979571 |
| 14 | 97979997979771 |
| 15 | 997979997978571 |
| 16 | 9997979997978571 |
| 17 | 79997979997979731 |
| 18 | 979997979997978531 |
[71,751,9721,79531,978521,7979771,97979771, 997979371,9997979371,79997979521,979997978551, 7979997979571,97979997979771,997979997978571, 9997979997978571,79997979997979731, 979997979997978531] |