The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 90 |
| 11 | 909 |
| 12 | 9090 |
| 13 | 90909 |
| 14 | 909090 |
| 15 | 9090909 |
| 16 | 90909090 |
| 17 | 909090909 |
| 18 | 9090909090 |
| 19 | 90909090909 |
| 20 | 909090909090 |
| 21 | 9090909090909 |
| 22 | 90909090909090 |
| 23 | 909090909090909 |
| 24 | 9090909090909090 |
| 25 | 90909090909090909 |
| 26 | 909090909090909090 |
| 27 | 9090909090909090909 |
[1,2,3,4,5,6,7,8,9,90,909,9090,90909,909090, 9090909,90909090,909090909,9090909090,90909090909, 909090909090,9090909090909,90909090909090, 909090909090909,9090909090909090, 90909090909090909,909090909090909090, 9090909090909090909] |