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A248595 as a simple table

na(n)
15
27
311
423
523
641
753
859
947
1059
11157
12113
1383
14131
15239
16107
17179
18307
19337
20359
21367
22239
23167
24179
25293
26509
27311
28751
29547
30227
31383
32263
331511
34419
35449
36757
37787
38491
39503
40347
41359
42907
43383
44967
45593
46599
471481
481117
49683
501607
51467
52479
531693

[5,7,11,23,23,41,53,59,47,59,157,113,83,131,239,
 107,179,307,337,359,367,239,167,179,293,509,311,
 751,547,227,383,263,1511,419,449,757,787,491,503,
 347,359,907,383,967,593,599,1481,1117,683,1607,
 467,479,1693]