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A054797 as a simple table

na(n)
12
23
35
47
529
6399999998999
7789989999999999
889989999999999999
9299999899999999999999
104799999999999999999999
1188999999999999999999999999999999999
123999899999999999999999999999999999999999
13689999999999999999999999999999999989999999
146999989999999999999999999999999999999999999

[2,3,5,7,29,399999998999,789989999999999,
 89989999999999999,299999899999999999999,
 4799999999999999999999,
 88999999999999999999999999999999999,
 3999899999999999999999999999999999999999,
 689999999999999999999999999999999989999999,
 6999989999999999999999999999999999999999999]