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A308340 as a simple table

na(n)
13
23
37
45
57
67
723
829
913
1011
1111
1211
1331
1429
1529
1631
1731
1831
1931
2023
2123
2229
2331
2431
2531
2629
2729
2831
2931
3059
3137
3237
3337
3441
3543
3643
3743
3843
3947
4047
4147
4247
4347
4447
4561
4653
4753
4853
4959
5059
5159
5259
5359
5461
5561
56127
57127
58127
59127
60127
6171
62127
63127
6471
6579

[3,3,7,5,7,7,23,29,13,11,11,11,31,29,29,31,31,31,
 31,23,23,29,31,31,31,29,29,31,31,59,37,37,37,41,
 43,43,43,43,47,47,47,47,47,47,61,53,53,53,59,59,
 59,59,59,61,61,127,127,127,127,127,71,127,127,71,
 79]