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A216739 as a simple table

na(n)
15
27
313
417
523
629
731
837
941
1047
1153
1261
1371
1473
1579
1689
1797
18101
19103
20109
21113
22127
23137
24149
25151
26157
27167
28173
29181
30191
31193
32197
33199
34223
35229
36233
37239
38241
39263
40269
41271
42277
43293
44311
45313
46317
47337
48349
49353
50359
51367
52373
53383
54389
55397

[5,7,13,17,23,29,31,37,41,47,53,61,71,73,79,89,97,
 101,103,109,113,127,137,149,151,157,167,173,181,
 191,193,197,199,223,229,233,239,241,263,269,271,
 277,293,311,313,317,337,349,353,359,367,373,383,
 389,397]