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A236476 as a simple table

na(n)
13
27
343
473
5103
6109
7127
8139
9151
10199
11223
12241
13283
14313
15367
16379
17421
18541
19631
20661
21733
22739
23751
24769
25829
26991
271117
281129
291201
301231
311249
321297
331303
341429
351471
361663
371669
381693
391699
401741
411789
421867
431933

[3,7,43,73,103,109,127,139,151,199,223,241,283,
 313,367,379,421,541,631,661,733,739,751,769,829,
 991,1117,1129,1201,1231,1249,1297,1303,1429,1471,
 1663,1669,1693,1699,1741,1789,1867,1933]