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A233281 as a simple table

na(n)
12
25
313
437
573
689
7113
8149
9157
10193
11233
12269
13277
14313
15353
16389
17397
18457
19557
20613
21673
22677
23733
24757
25877
26953
27977
28997
291069
301093
311153
321213
331237
341453
351597
361657
371753
381873
391877
401933
411949
421993
432017
442137
452221
462237
472309
482333
492417
502473

[2,5,13,37,73,89,113,149,157,193,233,269,277,313,
 353,389,397,457,557,613,673,677,733,757,877,953,
 977,997,1069,1093,1153,1213,1237,1453,1597,1657,
 1753,1873,1877,1933,1949,1993,2017,2137,2221,2237,
 2309,2333,2417,2473]