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A238851 as a simple table

na(n)
12
23
35
47
511
613
753
859
961
1083
1189
12113
13179
14191
15211
16863
17947
18977
19983
20991
211429
221439
231823
243061
253067
263389
2715161
2815643
2915733
3015737
3115739
3215859
3323029
3448989
3548991
36251737
37251831
38253751
39368471
404060019

[2,3,5,7,11,13,53,59,61,83,89,113,179,191,211,863,
 947,977,983,991,1429,1439,1823,3061,3067,3389,
 15161,15643,15733,15737,15739,15859,23029,48989,
 48991,251737,251831,253751,368471,4060019]