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A268477 as a simple table

na(n)
12
23
37
431
537
641
743
853
973
1083
1189
12101
13107
14109
15127
16137
17139
18151
19157
20163
21167
22179
23197
24211
25229
26233
27269
28281
29283
30307
31311
32313
33317
34353
35359
36367
37379
38389
39397
40401
41409
42419
43431
44433
45439
46443
47457
48461
49467
50491
51521
52523
53541
54547
55563

[2,3,7,31,37,41,43,53,73,83,89,101,107,109,127,
 137,139,151,157,163,167,179,197,211,229,233,269,
 281,283,307,311,313,317,353,359,367,379,389,397,
 401,409,419,431,433,439,443,457,461,467,491,521,
 523,541,547,563]