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A165852 as a simple table

na(n)
11
231
331
4961
531
6961
731
829791
9961
10961
1131
1229791
1331
14961
15961
16923521
1731
1829791
1931
2029791
21961
22961
2331
24923521
25961
26961
2729791
2829791
2931
3029791
3131
3228629151
33961
34961
35961
36923521
3731
38961
39961
40923521
4131
4229791
4331
4429791
4529791

[1,31,31,961,31,961,31,29791,961,961,31,29791,31,
 961,961,923521,31,29791,31,29791,961,961,31,
 923521,961,961,29791,29791,31,29791,31,28629151,
 961,961,961,923521,31,961,961,923521,31,29791,31,
 29791,29791]