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A305420 as a simple table

na(n)
12
23
37
47
57
67
711
811
911
1011
1113
1213
1319
1419
1519
1619
1719
1819
1925
2025
2125
2225
2325
2425
2531
2631
2731
2831
2931
3031
3137
3237
3337
3437
3537
3637
3741
3841
3941
4041
4147
4247
4347
4447
4547
4647
4755
4855
4955
5055
5155
5255
5355
5455
5559
5659
5759
5859
5961
6061
6167
6267
6367
6467
6567
6667
6773
6873
6973
7073
7173
7273
7387
7487
7587
7687
7787
7887
7987
8087
8187
8287
8387
8487
8587
8687
8791

[2,3,7,7,7,7,11,11,11,11,13,13,19,19,19,19,19,19,
 25,25,25,25,25,25,31,31,31,31,31,31,37,37,37,37,
 37,37,41,41,41,41,47,47,47,47,47,47,55,55,55,55,
 55,55,55,55,59,59,59,59,61,61,67,67,67,67,67,67,
 73,73,73,73,73,73,87,87,87,87,87,87,87,87,87,87,
 87,87,87,87,91]