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A154761 as a simple table

na(n)
12
23
35
47
523
637
743
847
953
1067
1173
1283
13223
14227
15233
16257
17263
18277
19283
20307
21337
22347
23353
24367
25373
26383
27433
28443
29457
30463
31467
32487
33503
34523
35547
36557
37563
38577
39587
40607
41643
42647
43653
44673
45677
46683
47727
48733
49743
50757
51773
52787
53823
54827
55853

[2,3,5,7,23,37,43,47,53,67,73,83,223,227,233,257,
 263,277,283,307,337,347,353,367,373,383,433,443,
 457,463,467,487,503,523,547,557,563,577,587,607,
 643,647,653,673,677,683,727,733,743,757,773,787,
 823,827,853]