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A168421 as a simple table

na(n)
12
27
311
417
523
629
731
837
937
1053
1153
1259
1367
1479
1579
1689
1797
1897
19127
20127
21127
22127
23127
24137
25137
26149
27157
28157
29179
30179
31191
32191
33211
34211
35211
36223
37223
38223
39233
40251
41251
42257
43293
44293
45307
46307
47307
48307
49307
50331
51331
52331

[2,7,11,17,23,29,31,37,37,53,53,59,67,79,79,89,97,
 97,127,127,127,127,127,137,137,149,157,157,179,
 179,191,191,211,211,211,223,223,223,233,251,251,
 257,293,293,307,307,307,307,307,331,331,331]