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A140555 as a simple table

na(n)
12
23
319
429
543
659
771
879
989
10109
11113
12127
13137
14139
15149
16163
17179
18181
19197
20199
21211
22229
23239
24241
25269
26281
27283
28293
29313
30317
31337
32349
33359
34379
35389
36397
37401
38409
39419
40421
41431
42439
43449
44463
45467
46479
47487
48491
49499
50509
51521
52523
53547
54569

[2,3,19,29,43,59,71,79,89,109,113,127,137,139,149,
 163,179,181,197,199,211,229,239,241,269,281,283,
 293,313,317,337,349,359,379,389,397,401,409,419,
 421,431,439,449,463,467,479,487,491,499,509,521,
 523,547,569]