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A038988 as a simple table

na(n)
15
27
313
417
519
623
729
837
941
1059
1167
1271
1383
14107
15127
16131
17137
18139
19149
20157
21173
22179
23181
24199
25211
26223
27233
28239
29251
30257
31263
32271
33277
34281
35311
36317
37331
38337
39347
40349
41359
42367
43373
44383
45401
46409

[5,7,13,17,19,23,29,37,41,59,67,71,83,107,127,131,
 137,139,149,157,173,179,181,199,211,223,233,239,
 251,257,263,271,277,281,311,317,331,337,347,349,
 359,367,373,383,401,409]