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A038981 as a simple table

na(n)
13
27
311
417
519
623
729
831
953
1067
1183
1289
1397
14103
15109
16137
17157
18163
19167
20179
21193
22197
23211
24239
25251
26263
27269
28283
29307
30347
31349
32353
33373
34379
35383
36389
37397
38401
39421
40439
41449
42461
43491
44509
45541
46547

[3,7,11,17,19,23,29,31,53,67,83,89,97,103,109,137,
 157,163,167,179,193,197,211,239,251,263,269,283,
 307,347,349,353,373,379,383,389,397,401,421,439,
 449,461,491,509,541,547]