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A302938 as a simple table

n a(n)
1 1
2 2
3 4
4 7
5 44
6 47
7 74
8 77
9 444
10 447
11 474
12 477
13 744
14 747
15 774
16 777
17 4444
18 4447
19 4474
20 4477
21 4744
22 4747
23 4774
24 4777
25 7444
26 7447
27 7474
28 7477
29 7744
30 7747
31 7774
32 7777
33 44444
34 44447
35 44474
36 44477
37 44744
38 44747
39 44774
40 44777
41 47444
42 47447
43 47474
44 47477
45 47744
46 47747
47 47774
48 47777
49 74444
50 74447

[1,2,4,7,44,47,74,77,444,447,474,477,744,747,774,
 777,4444,4447,4474,4477,4744,4747,4774,4777,7444,
 7447,7474,7477,7744,7747,7774,7777,44444,44447,
 44474,44477,44744,44747,44774,44777,47444,47447,
 47474,47477,47744,47747,47774,47777,74444,74447]

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Last modified July 10 23:30 EDT 2020. Contains 335600 sequences. (Running on oeis4.)