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A198973 as a simple table

n a(n)
0 7
1 79
2 799
3 7999
4 79999
5 799999
6 7999999
7 79999999
8 799999999
9 7999999999
10 79999999999
11 799999999999
12 7999999999999
13 79999999999999
14 799999999999999
15 7999999999999999
16 79999999999999999
17 799999999999999999
18 7999999999999999999

[7,79,799,7999,79999,799999,7999999,79999999,
 799999999,7999999999,79999999999,799999999999,
 7999999999999,79999999999999,799999999999999,
 7999999999999999,79999999999999999,
 799999999999999999,7999999999999999999]

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Last modified May 20 00:55 EDT 2022. Contains 353847 sequences. (Running on oeis4.)