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A309292 as a simple table

na(n)
15
27
315
419
521
633
739
843
955
1061
1169
1273
1391
14105
15109
16111
17115
18133
19141
20159
21165
22181
23183
24195
25199
26201
27213
28231
29235
30241
31253
32259
33271
34273
35285
36295
37309
38313
39339
40349
41381
42385
43399
44403
45411
46421
47433
48435
49451
50465
51469
52489
53493
54501
55505

[5,7,15,19,21,33,39,43,55,61,69,73,91,105,109,111,
 115,133,141,159,165,181,183,195,199,201,213,231,
 235,241,253,259,271,273,285,295,309,313,339,349,
 381,385,399,403,411,421,433,435,451,465,469,489,
 493,501,505]