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A019421 as a simple table

na(n)
12
217
323
441
547
659
767
871
973
10101
11103
12109
13149
14173
15179
16191
17197
18199
19223
20233
21241
22251
23277
24293
25311
26331
27337
28349
29367
30373
31379
32383
33409
34419
35443
36457
37461
38467
39499
40541
41557
42569
43587
44593
45599
46613
47619
48631
49643
50673
51677
52683
53691
54719
55733
56761

[2,17,23,41,47,59,67,71,73,101,103,109,149,173,
 179,191,197,199,223,233,241,251,277,293,311,331,
 337,349,367,373,379,383,409,419,443,457,461,467,
 499,541,557,569,587,593,599,613,619,631,643,673,
 677,683,691,719,733,761]