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A270753 as a simple table

na(n)
15
23
33
45
55
67
77
811
911
1011
1111
1213
1313
1417
1517
1617
1717
1819
1919
2023
2123
2223
2323
2429
2529
2629
2729
2829
2929
3031
3131
3237
3337
3437
3537
3637
3737
3841
3941
4041
4141
4243
4343
4447
4547
4647
4747
4853
4953
5053
5153
5253
5353
5459
5559
5659
5759
5859
5959
6061
6161
6267
6367
6467
6567
6667

[5,3,3,5,5,7,7,11,11,11,11,13,13,17,17,17,17,19,
 19,23,23,23,23,29,29,29,29,29,29,31,31,37,37,37,
 37,37,37,41,41,41,41,43,43,47,47,47,47,53,53,53,
 53,53,53,59,59,59,59,59,59,61,61,67,67,67,67,67]