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A139603 as a simple table

na(n)
12
27
311
419
543
679
783
8107
9127
10131
11139
12151
13167
14211
15227
16239
17263
18271
19283
20307
21347
22359
23431
24439
25479
26491
27503
28523
29547
30563
31571
32607
33659
34739
35743
36787
37811
38827
39887
40919
41967

[2,7,11,19,43,79,83,107,127,131,139,151,167,211,
 227,239,263,271,283,307,347,359,431,439,479,491,
 503,523,547,563,571,607,659,739,743,787,811,827,
 887,919,967]