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A038949 as a simple table

na(n)
13
27
311
417
529
631
737
843
967
1073
1179
1289
13139
14149
15157
16173
17179
18181
19191
20193
21239
22241
23251
24257
25269
26271
27277
28293
29311
30317
31331
32347
33349
34367
35379
36383
37389
38397
39421
40443
41449
42457
43461
44463
45487

[3,7,11,17,29,31,37,43,67,73,79,89,139,149,157,
 173,179,181,191,193,239,241,251,257,269,271,277,
 293,311,317,331,347,349,367,379,383,389,397,421,
 443,449,457,461,463,487]