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A173837 as a simple table

na(n)
12
297
399991
499999999999973
5999999999999999999999999999999999999999917
6999999999999999999999999999999999999999999999999999999999999999999999857
799999999999999999999999999999999999999999999999999999999999999999999999853

[2,97,99991,99999999999973,
 999999999999999999999999999999999999999917,
 99999999999999999999999999999999999999999999999999\
 9999999999999999999857,
 99999999999999999999999999999999999999999999999999\
 999999999999999999999853]