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A143967 as a simple table

n a(n)
1 3
2 7
3 33
4 37
5 73
6 77
7 333
8 337
9 373
10 377
11 733
12 737
13 773
14 777
15 3333
16 3337
17 3373
18 3377
19 3733
20 3737
21 3773
22 3777
23 7333
24 7337
25 7373
26 7377
27 7733
28 7737
29 7773
30 7777
31 33333
32 33337
33 33373
34 33377
35 33733
36 33737
37 33773
38 33777
39 37333
40 37337
41 37373
42 37377

[3,7,33,37,73,77,333,337,373,377,733,737,773,777,
 3333,3337,3373,3377,3733,3737,3773,3777,7333,7337,
 7373,7377,7733,7737,7773,7777,33333,33337,33373,
 33377,33733,33737,33773,33777,37333,37337,37373,
 37377]

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Last modified August 22 00:43 EDT 2019. Contains 326169 sequences. (Running on oeis4.)