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A038978 as a simple table

na(n)
13
27
313
419
523
629
731
837
941
1043
1159
1261
1383
14101
15103
16113
17127
18137
19149
20151
21163
22181
23191
24193
25197
26211
27229
28239
29241
30281
31293
32313
33337
34349
35353
36359
37379
38383
39389
40397
41419
42421
43431
44433
45439
46457

[3,7,13,19,23,29,31,37,41,43,59,61,83,101,103,113,
 127,137,149,151,163,181,191,193,197,211,229,239,
 241,281,293,313,337,349,353,359,379,383,389,397,
 419,421,431,433,439,457]