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A161681 as a simple table

na(n)
12
27
311
413
519
623
747
853
961
1067
1171
1279
1383
1489
15107
16109
17127
18139
19151
20167
21191
22193
23199
24223
25233
26239
27251
28271
29277
30293
31307
32359
33431
34433
35439
36463
37487
38499
39503
40547
41557
42587
43593
44599
45631
46647
47673
48683
49719
50727
51769
52797
53859
54887
55919

[2,7,11,13,19,23,47,53,61,67,71,79,83,89,107,109,
 127,139,151,167,191,193,199,223,233,239,251,271,
 277,293,307,359,431,433,439,463,487,499,503,547,
 557,587,593,599,631,647,673,683,719,727,769,797,
 859,887,919]