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A188131 as a simple table

na(n)
15
213
317
437
561
673
7101
8137
9173
10181
11233
12241
13257
14277
15293
16313
17373
18397
19461
20557
21577
22593
23601
24641
25653
26661
27761
28773
29797
30853
31937
32941
331013
341033
351061
361117
371193
381201
391321
401361
411381
421433
431453
441481
451553
461613
471693
481733
491777
501873
511973
521993

[5,13,17,37,61,73,101,137,173,181,233,241,257,277,
 293,313,373,397,461,557,577,593,601,641,653,661,
 761,773,797,853,937,941,1013,1033,1061,1117,1193,
 1201,1321,1361,1381,1433,1453,1481,1553,1613,1693,
 1733,1777,1873,1973,1993]