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A071680 as a simple table

na(n)
15
237
353
467
5157
6173
7211
8257
9263
10277
11373
12479
13563
14593
15607
16613
17631
18653
19733
20809
21947
22977
231009
241103
251123
261187
271223
281297
291367
301471
311511
321607
331663
341721
351747
361753
371783
381867
391901
401907
411931
421993
432137
442287
452377
462411
472417

[5,37,53,67,157,173,211,257,263,277,373,479,563,
 593,607,613,631,653,733,809,947,977,1009,1103,
 1123,1187,1223,1297,1367,1471,1511,1607,1663,1721,
 1747,1753,1783,1867,1901,1907,1931,1993,2137,2287,
 2377,2411,2417]