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A253971 as a simple table

na(n)
12
23
37
419
537
643
779
8113
9151
10163
11193
12229
13251
14281
15317
16373
17397
18433
19463
20503
21577
22757
23827
24911
25953
26997
271069
281123
291321
301399
311423
321481
331657
341693
351747
362029
372143
382267
392311
402473
412503
422551
432593
442687
452753
462791
472917
483313
493323

[2,3,7,19,37,43,79,113,151,163,193,229,251,281,
 317,373,397,433,463,503,577,757,827,911,953,997,
 1069,1123,1321,1399,1423,1481,1657,1693,1747,2029,
 2143,2267,2311,2473,2503,2551,2593,2687,2753,2791,
 2917,3313,3323]