n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 7 |
4 | 9 |
5 | 11 |
6 | 77 |
7 | 111 |
8 | 707 |
9 | 777 |
10 | 909 |
11 | 1111 |
12 | 7777 |
13 | 11111 |
14 | 70707 |
15 | 77777 |
16 | 90909 |
17 | 111111 |
18 | 777777 |
19 | 1111111 |
20 | 7070707 |
21 | 7777777 |
22 | 9090909 |
23 | 11111111 |
24 | 77777777 |
25 | 111111111 |
26 | 707070707 |
27 | 777777777 |
28 | 909090909 |
29 | 1111111111 |
30 | 7777777777 |
31 | 11111111111 |
[1,3,7,9,11,77,111,707,777,909,1111,7777,11111, 70707,77777,90909,111111,777777,1111111,7070707, 7777777,9090909,11111111,77777777,111111111, 707070707,777777777,909090909,1111111111, 7777777777,11111111111] |