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A178556 as a simple table

n a(n)
1 77767777
2 77777177
3 77777377
4 77777747
5 137777777
6 172777777
7 177677777
8 177776777
9 177777377
10 177777577
11 177777727
12 177777773
13 177777779
14 177797777
15 197777777
16 272777777
17 277177777
18 277727777
19 277771777
20 277775777
21 277777177

[77767777,77777177,77777377,77777747,137777777,
 172777777,177677777,177776777,177777377,177777577,
 177777727,177777773,177777779,177797777,197777777,
 272777777,277177777,277727777,277771777,277775777,
 277777177]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)