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A087952 as a simple table

na(n)
12
25
313
417
531
637
771
873
9109
10101
11199
12157
13313
14197
15241
16257
17307
18379
19419
20401
21463
22617
23599
24577
25701
26677
27757
28953
29929
30991
311117
321153
331123
341259
351471
361297
371481
381483
391873
401601
411723
421933
431979
442069
452161
462347
472351
482593
492549
502551

[2,5,13,17,31,37,71,73,109,101,199,157,313,197,
 241,257,307,379,419,401,463,617,599,577,701,677,
 757,953,929,991,1117,1153,1123,1259,1471,1297,
 1481,1483,1873,1601,1723,1933,1979,2069,2161,2347,
 2351,2593,2549,2551]