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A003618 as a simple table

na(n)
17
297
3997
49973
599991
6999983
79999991
899999989
9999999937
109999999967
1199999999977
12999999999989
139999999999971
1499999999999973
15999999999999989
169999999999999937
1799999999999999997
18999999999999999989
199999999999999999961
2099999999999999999989

[7,97,997,9973,99991,999983,9999991,99999989,
 999999937,9999999967,99999999977,999999999989,
 9999999999971,99999999999973,999999999999989,
 9999999999999937,99999999999999997,
 999999999999999989,9999999999999999961,
 99999999999999999989]