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A075540 as a simple table

na(n)
15
253
3157
4173
5211
6257
7263
8373
9511
10537
11563
12593
13607
14653
15733
16947
17977
18999
191073
201103
211123
221187
231223
241239
251367
261461
271501
281511
291541
301747
311753
321763
331773
341899
351907
361917
372071
382181
392287
402401
412409
422417
432449
442677
452903
462963

[5,53,157,173,211,257,263,373,511,537,563,593,607,
 653,733,947,977,999,1073,1103,1123,1187,1223,1239,
 1367,1461,1501,1511,1541,1747,1753,1763,1773,1899,
 1907,1917,2071,2181,2287,2401,2409,2417,2449,2677,
 2903,2963]