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A103966 as a simple table

na(n)
13
27
313
419
531
643
761
873
9103
10109
11131
12151
13181
14193
15199
16229
17241
18271
19283
20313
21349
22389
23433
24449
25491
26503
27563
28569
29577
30593
31599
32607
33613
34653
35659
36683
37733
38739
39757
40947
41953
42977

[3,7,13,19,31,43,61,73,103,109,131,151,181,193,
 199,229,241,271,283,313,349,389,433,449,491,503,
 563,569,577,593,599,607,613,653,659,683,733,739,
 757,947,953,977]