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A243593 as a simple table

na(n)
15
27
311
413
517
623
729
837
941
1053
1159
1297
13101
14127
15131
16137
17149
18223
19227
20307
21331
22337
23347
24349
25419
26541
27547
28557
29563
30569
31587
32809
33821
34967
351277
361361
371367
381399
391409
401423
411427
421429
431433
441439
451447
461847
471861
481867
491871
501949
511973

[5,7,11,13,17,23,29,37,41,53,59,97,101,127,131,
 137,149,223,227,307,331,337,347,349,419,541,547,
 557,563,569,587,809,821,967,1277,1361,1367,1399,
 1409,1423,1427,1429,1433,1439,1447,1847,1861,1867,
 1871,1949,1973]