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A191080 as a simple table

na(n)
15
27
311
417
523
631
743
859
961
1073
1183
1297
13113
14139
15149
16151
17157
18181
19191
20193
21197
22211
23223
24227
25233
26241
27257
28263
29271
30277
31283
32293
33311
34317
35373
36409
37457
38461
39463
40487
41503
42509
43521
44523
45547
46557
47569
48571
49577
50587
51599
52631
53641
54647

[5,7,11,17,23,31,43,59,61,73,83,97,113,139,149,
 151,157,181,191,193,197,211,223,227,233,241,257,
 263,271,277,283,293,311,317,373,409,457,461,463,
 487,503,509,521,523,547,557,569,571,577,587,599,
 631,641,647]