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A028916 as a simple table

na(n)
12
25
317
437
541
697
7101
8137
9181
10197
11241
12257
13277
14281
15337
16401
17457
18577
19617
20641
21661
22677
23757
24769
25821
26857
27881
28977
291097
301109
311201
321217
331237
341297
351301
361321
371409
381481
391601
401657
411697
421777
432017
442069
452137
462281
472389
482417
492437

[2,5,17,37,41,97,101,137,181,197,241,257,277,281,
 337,401,457,577,617,641,661,677,757,769,821,857,
 881,977,1097,1109,1201,1217,1237,1297,1301,1321,
 1409,1481,1601,1657,1697,1777,2017,2069,2137,2281,
 2389,2417,2437]