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A321658 as a simple table

na(n)
15
217
337
441
573
689
797
8101
9131
10137
11149
12193
13199
14233
15257
16277
17281
18293
19313
20337
21347
22349
23353
24367
25373
26379
27389
28401
29409
30421
31521
32569
33577
34593
35601
36613
37617
38641
39661
40673
41677
42683
43761
44769
45809
46811
47823
48829
49853
50857
51859
52929
53937

[5,17,37,41,73,89,97,101,131,137,149,193,199,233,
 257,277,281,293,313,337,347,349,353,367,373,379,
 389,401,409,421,521,569,577,593,601,613,617,641,
 661,673,677,683,761,769,809,811,823,829,853,857,
 859,929,937]