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A338911 as a simple table

na(n)
19
221
339
449
557
687
791
8111
9129
10133
11159
12169
13183
14203
15213
16237
17247
18259
19267
20301
21303
22321
23339
24361
25371
26377
27393
28417
29427
30453
31481
32489
33497
34519
35543
36551
37553
38559
39579
40597
41623
42669
43687
44689
45703
46707
47717
48749
49753
50789
51791
52793
53813
54817

[9,21,39,49,57,87,91,111,129,133,159,169,183,203,
 213,237,247,259,267,301,303,321,339,361,371,377,
 393,417,427,453,481,489,497,519,543,551,553,559,
 579,597,623,669,687,689,703,707,717,749,753,789,
 791,793,813,817]