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A213901 as a simple table

na(n)
15
27
329
431
579
6103
7127
8149
9151
10173
11197
12199
13223
14269
15271
16293
17317
18367
19439
20463
21487
22557
23631
24701
25727
26751
27773
28797
29821
30823
31941
32967
33991
341039
351061

[5,7,29,31,79,103,127,149,151,173,197,199,223,269,
 271,293,317,367,439,463,487,557,631,701,727,751,
 773,797,821,823,941,967,991,1039,1061]