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A216771 as a simple table

na(n)
15
27
313
417
523
629
731
837
941
1047
1153
1261
1371
1479
1597
16101
17103
18109
19127
20131
21137
22149
23151
24157
25167
26173
27181
28191
29193
30197
31199
32223
33229
34239
35241
36263
37269
38271
39277
40293
41311
42313
43317
44349
45359
46367
47373
48383
49389
50397
51401
52409
53421
54431
55433

[5,7,13,17,23,29,31,37,41,47,53,61,71,79,97,101,
 103,109,127,131,137,149,151,157,167,173,181,191,
 193,197,199,223,229,239,241,263,269,271,277,293,
 311,313,317,349,359,367,373,383,389,397,401,409,
 421,431,433]