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A191076 as a simple table

na(n)
15
217
319
423
559
667
773
879
989
10101
11107
12109
13127
14131
15137
16149
17151
18157
19163
20167
21173
22199
23211
24223
25227
26239
27241
28263
29271
30283
31293
32307
33313
34317
35337
36349
37353
38367
39373
40379
41383
42397
43401
44409
45419
46421
47433
48443
49449
50457
51463
52467
53487
54541

[5,17,19,23,59,67,73,79,89,101,107,109,127,131,
 137,149,151,157,163,167,173,199,211,223,227,239,
 241,263,271,283,293,307,313,317,337,349,353,367,
 373,379,383,397,401,409,419,421,433,443,449,457,
 463,467,487,541]