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A323704 as a simple table

na(n)
12
23
35
43
511
65
717
87
923
1029
1111
1213
1341
1415
1547
1653
1759
1821
1923
2071
2125
2227
2383
2489
2533
26101
2735
28107
2937
30113
3143
32131
33137
3447
35149
3651
3753
3855
39167
40173
41179
4261
43191
4465
45197
4667
4771
4875
49227
5077
51233
52239
5381
54251
55257
56263
57269
5891
5993
60281
6195
62293

[2,3,5,3,11,5,17,7,23,29,11,13,41,15,47,53,59,21,
 23,71,25,27,83,89,33,101,35,107,37,113,43,131,137,
 47,149,51,53,55,167,173,179,61,191,65,197,67,71,
 75,227,77,233,239,81,251,257,263,269,91,93,281,95,
 293]