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A191019 as a simple table

na(n)
15
27
311
417
523
643
747
861
973
1083
11101
12131
13137
14139
15149
16157
17163
18191
19197
20199
21229
22233
23239
24251
25263
26271
27277
28283
29311
30313
31347
32349
33353
34359
35367
36389
37397
38419
39443
40457
41461
42463
43467
44479
45491
46499
47503
48541
49557
50571
51577
52587
53593
54613

[5,7,11,17,23,43,47,61,73,83,101,131,137,139,149,
 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,
 587,593,613]