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A038976 as a simple table

na(n)
15
27
311
437
547
653
761
867
973
1097
11103
12131
13139
14149
15151
16157
17173
18191
19193
20197
21199
22223
23229
24233
25251
26257
27263
28281
29283
30311
31337
32353
33359
34401
35409
36421
37433
38439
39443
40463
41467
42479
43487
44491
45499

[5,7,11,37,47,53,61,67,73,97,103,131,139,149,151,
 157,173,191,193,197,199,223,229,233,251,257,263,
 281,283,311,337,353,359,401,409,421,433,439,443,
 463,467,479,487,491,499]