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A365598 as a simple table

na(n)
1991
2997
399991
49999991
599999999999999997
6999999999999999999999999999999991
7999999999999999999999999999999999999999999991

[991,997,99991,9999991,99999999999999997,
 999999999999999999999999999999991,
 999999999999999999999999999999999999999999991]