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A164120 as a simple table

na(n)
15
27
317
421
541
649
789
8105
9185
10217
11377
12441
13761
14889
151529
161785
173065
183577
196137
207161
2112281
2214329
2324569
2428665
2549145
2657337
2798297
28114681
29196601
30229369
31393209
32458745
33786425
34917497
351572857
361835001
373145721
383670009

[5,7,17,21,41,49,89,105,185,217,377,441,761,889,
 1529,1785,3065,3577,6137,7161,12281,14329,24569,
 28665,49145,57337,98297,114681,196601,229369,
 393209,458745,786425,917497,1572857,1835001,
 3145721,3670009]