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A177681 as a simple table

na(n)
13
27
311
413
523
629
731
843
953
1079
11103
12107
13109
14127
15131
16137
17151
18157
19167
20173
21179
22181
23193
24199
25211
26227
27229
28233
29241
30257
31311
32317
33347
34349
35359
36367
37373
38379
39383
40431
41439
42443
43461
44463
45467
46479
47487
48491
49499
50503
51509
52523
53547
54571

[3,7,11,13,23,29,31,43,53,79,103,107,109,127,131,
 137,151,157,167,173,179,181,193,199,211,227,229,
 233,241,257,311,317,347,349,359,367,373,379,383,
 431,439,443,461,463,467,479,487,491,499,503,509,
 523,547,571]