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A038968 as a simple table

na(n)
15
27
317
437
543
647
759
861
971
1079
1183
1289
1397
14107
15131
16137
17139
18151
19163
20167
21173
22191
23193
24197
25199
26233
27239
28251
29257
30263
31269
32277
33281
34283
35307
36311
37313
38349
39373
40379
41383
42389
43419
44439
45443
46457

[5,7,17,37,43,47,59,61,71,79,83,89,97,107,131,137,
 139,151,163,167,173,191,193,197,199,233,239,251,
 257,263,269,277,281,283,307,311,313,349,373,379,
 383,389,419,439,443,457]