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A175768 as a simple table

na(n)
15
213
317
429
537
641
753
861
973
1089
1197
12101
13109
14113
15137
16149
17157
18163
19173
20181
21193
22197
23229
24233
25241
26257
27269
28271
29277
30281
31293
32313
33317
34337
35349
36353
37373
38379
39389
40397
41401
42409
43421
44433
45449
46457
47461
48487
49509
50521
51541
52557
53569
54577
55593
56601
57613

[5,13,17,29,37,41,53,61,73,89,97,101,109,113,137,
 149,157,163,173,181,193,197,229,233,241,257,269,
 271,277,281,293,313,317,337,349,353,373,379,389,
 397,401,409,421,433,449,457,461,487,509,521,541,
 557,569,577,593,601,613]