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A049590 as a simple table

na(n)
12
27
317
423
531
641
747
871
973
1079
1189
1297
13103
14113
15127
16137
17151
18167
19191
20193
21199
22223
23239
24241
25257
26263
27271
28281
29311
30313
31337
32353
33359
34367
35383
36401
37409
38431
39433
40439
41449
42457
43463
44479
45487
46503
47521
48569
49577
50593
51599
52601
53607
54617
55631

[2,7,17,23,31,41,47,71,73,79,89,97,103,113,127,
 137,151,167,191,193,199,223,239,241,257,263,271,
 281,311,313,337,353,359,367,383,401,409,431,433,
 439,449,457,463,479,487,503,521,569,577,593,599,
 601,607,617,631]