# A284971 (b-file synthesized from sequence entry)
1 4
2 7
3 44
4 47
5 74
6 77
7 444
8 447
9 474
10 477
11 744
12 747
13 774
14 777
15 4444
16 4447
17 4474
18 4477
19 4744
20 4747
21 4774
22 4777
23 7444
24 7447
25 7474
26 7477
27 7744
28 7747
29 7774
30 7777
31 44444
32 44447
33 44474
34 44477
35 44744
36 44747
37 44774
38 44777
39 47444
40 47447
41 47474
42 47477
43 47744
44 47747