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A155772 as a simple table

na(n)
15
27
311
417
519
623
729
853
959
1061
1183
12101
13103
14107
15131
16151
17179
18181
19191
20193
21199
22227
23239
24269
25281
26293
27313
28367
29383
30389
31419
32439
33467
34487
35503
36521
37541
38569
39587
40599
41601
42607
43617
44641
45647
46653
47673
48677
49691
50709
51733
52739
53757
54769
55787

[5,7,11,17,19,23,29,53,59,61,83,101,103,107,131,
 151,179,181,191,193,199,227,239,269,281,293,313,
 367,383,389,419,439,467,487,503,521,541,569,587,
 599,601,607,617,641,647,653,673,677,691,709,733,
 739,757,769,787]