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A106863 as a simple table

na(n)
15
27
311
417
519
623
743
847
961
1073
1183
12101
13131
14137
15139
16149
17157
18163
19191
20197
21199
22229
23233
24239
25251
26263
27271
28277
29283
30311
31313
32347
33349
34353
35359
36367
37389
38397
39419
40443
41457
42461
43463
44467
45479
46491
47499
48503
49541
50557
51571
52577
53587
54593

[5,7,11,17,19,23,43,47,61,73,83,101,131,137,139,
 149,157,163,191,197,199,229,233,239,251,263,271,
 277,283,311,313,347,349,353,359,367,389,397,419,
 443,457,461,463,467,479,491,499,503,541,557,571,
 577,587,593]