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A225421 as a simple table

na(n)
13
25
37
411
519
653
759
8151
9353
10557
11599
12773
13997
145557
157559
1611119
1715559
1859999
1971777
2075553
2179999
2299991
23191999
24511111
25555557
26575557
27775777
28777977
29799979
301111151
313353333
325595559
335755559
347577777
359999991
3633335333
3755555553
3855555559

[3,5,7,11,19,53,59,151,353,557,599,773,997,5557,
 7559,11119,15559,59999,71777,75553,79999,99991,
 191999,511111,555557,575557,775777,777977,799979,
 1111151,3353333,5595559,5755559,7577777,9999991,
 33335333,55555553,55555559]