n | a(n) |
---|---|
1 | 7 |
2 | 79 |
3 | 97 |
4 | 797 |
5 | 977 |
6 | 997 |
7 | 77797 |
8 | 77977 |
9 | 77999 |
10 | 79777 |
11 | 79979 |
12 | 79997 |
13 | 79999 |
14 | 97777 |
15 | 777977 |
16 | 777979 |
17 | 779797 |
18 | 797977 |
19 | 799979 |
20 | 799999 |
21 | 999979 |
22 | 7777997 |
23 | 7779979 |
24 | 7779997 |
25 | 7797799 |
26 | 7797997 |
27 | 7799797 |
28 | 7799999 |
29 | 7977779 |
30 | 7977797 |
31 | 7977799 |
32 | 7977997 |
[7,79,97,797,977,997,77797,77977,77999,79777, 79979,79997,79999,97777,777977,777979,779797, 797977,799979,799999,999979,7777997,7779979, 7779997,7797799,7797997,7799797,7799999,7977779, 7977797,7977799,7977997] |