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A253624 as a simple table

na(n)
15
217
31277
44217
521587
691127
7103967
8113147
9122027
10236867
11342047
12422087
13524957
14560477
15626597
16754967
17797567
18909317
19997097
201322147
211493717
221698857
231748027
241762907
252144477
262158577
272228507
282398157
292580647
302615957

[5,17,1277,4217,21587,91127,103967,113147,122027,
 236867,342047,422087,524957,560477,626597,754967,
 797567,909317,997097,1322147,1493717,1698857,
 1748027,1762907,2144477,2158577,2228507,2398157,
 2580647,2615957]