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A239586 as a simple table

na(n)
12
23
33
45
57
65
77
85
97
107
1111
1213
1313
1417
1519
1617
1719
1823
1917
2023
2129
2219
2331
2419
2529
2623
2731
2837
2923
3041
3143
3237
3329
3447
3531
3623
3741
3829
3943
4053
4131
4247
4337
4459
4529
4661
4753
4841
4937
5031
5143
5267
5359
5441
5571
5661
5747
5873
5943
6029
6137
6279
6367
6447
6531
6653
6783

[2,3,3,5,7,5,7,5,7,7,11,13,13,17,19,17,19,23,17,
 23,29,19,31,19,29,23,31,37,23,41,43,37,29,47,31,
 23,41,29,43,53,31,47,37,59,29,61,53,41,37,31,43,
 67,59,41,71,61,47,73,43,29,37,79,67,47,31,53,83]