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A238460 as a simple table

na(n)
15
213
337
441
5101
6113
7157
8173
9181
10197
11229
12241
13281
14313
15337
16349
17353
18373
19409
20421
21433
22509
23541
24617
25677
26701
27757
28761
29769
30773
31821
32929
33941
34977
35997
361013
371093
381097
391109
401181
411193
421237
431409
441433
451481
461489
471669
481693
491721
501741

[5,13,37,41,101,113,157,173,181,197,229,241,281,
 313,337,349,353,373,409,421,433,509,541,617,677,
 701,757,761,769,773,821,929,941,977,997,1013,1093,
 1097,1109,1181,1193,1237,1409,1433,1481,1489,1669,
 1693,1721,1741]