n | a(n) |
---|---|
1 | 3 |
2 | 7 |
3 | 37 |
4 | 43 |
5 | 47 |
6 | 73 |
7 | 337 |
8 | 347 |
9 | 373 |
10 | 433 |
11 | 443 |
12 | 733 |
13 | 743 |
14 | 773 |
15 | 3343 |
16 | 3347 |
17 | 3373 |
18 | 3433 |
19 | 3733 |
20 | 4337 |
21 | 4373 |
22 | 4447 |
23 | 4733 |
24 | 7333 |
25 | 7433 |
26 | 7477 |
27 | 33343 |
28 | 33347 |
29 | 33377 |
30 | 33773 |
31 | 34337 |
32 | 34747 |
33 | 37337 |
34 | 37447 |
35 | 37747 |
36 | 43777 |
37 | 44773 |
38 | 44777 |
39 | 47737 |
40 | 47743 |
41 | 47777 |
42 | 73433 |
43 | 73477 |
44 | 74377 |
45 | 74747 |
46 | 77347 |
47 | 77377 |
48 | 77447 |
49 | 77477 |
50 | 77743 |
[3,7,37,43,47,73,337,347,373,433,443,733,743,773, 3343,3347,3373,3433,3733,4337,4373,4447,4733,7333, 7433,7477,33343,33347,33377,33773,34337,34747, 37337,37447,37747,43777,44773,44777,47737,47743, 47777,73433,73477,74377,74747,77347,77377,77447, 77477,77743] |