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A082520 as a simple table

na(n)
12
23
35
4191
519391
638183
71508051
81609061
91628261
103717173
113916193
12161535161
13161838161
14170646071
15172747271
16182949281
17190909091
18352909253
19354848453
20360818063
21364636463
2215052625051
2315150805151
2415253635251

[2,3,5,191,19391,38183,1508051,1609061,1628261,
 3717173,3916193,161535161,161838161,170646071,
 172747271,182949281,190909091,352909253,354848453,
 360818063,364636463,15052625051,15150805151,
 15253635251]