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A291276 as a simple table

na(n)
12
27
313
437
561
673
7109
8127
9157
10163
11193
12211
13223
14229
15271
16283
17307
18313
19331
20337
21349
22367
23379
24409
25421
26433
27463
28487
29499
30523
31577
32607
33613
34619
35631
36661
37673
38691
39727
40733
41751
42757
43769
44787
45823
46829
47853
48883
49907
50919
511021
521039

[2,7,13,37,61,73,109,127,157,163,193,211,223,229,
 271,283,307,313,331,337,349,367,379,409,421,433,
 463,487,499,523,577,607,613,619,631,661,673,691,
 727,733,751,757,769,787,823,829,853,883,907,919,
 1021,1039]