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A216773 as a simple table

na(n)
15
27
313
417
523
629
731
837
941
1043
1147
1253
1361
1471
1573
1679
1789
1897
19101
20103
21109
22113
23127
24137
25149
26151
27157
28167
29173
30181
31191
32193
33197
34199
35211
36223
37229
38233
39239
40241
41263
42269
43271
44277
45281
46293
47311
48313
49317
50337
51349
52353
53359
54367
55373

[5,7,13,17,23,29,31,37,41,43,47,53,61,71,73,79,89,
 97,101,103,109,113,127,137,149,151,157,167,173,
 181,191,193,197,199,211,223,229,233,239,241,263,
 269,271,277,281,293,311,313,317,337,349,353,359,
 367,373]