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A139421 as a simple table

na(n)
11
22
33
42
55
63
77
83
97
105
1111
125
1313
147
1513
167
1717
187
1919
207
2119
2211
2323
2411
2523
2613
2723
2813
2929
3013
3131
3213
3331
3417
3531
3617
3737
3819
3937
4019
4141
4219
4343
4419
4543
4623
4747
4823
4947
5023
5147
5223
5353
5423
5553
5623
5753
5829
5959
6029
6161
6231
6361
6431
6561
6631
6767
6831
6967
7031
7171
7231
7373
7437

[1,2,3,2,5,3,7,3,7,5,11,5,13,7,13,7,17,7,19,7,19,
 11,23,11,23,13,23,13,29,13,31,13,31,17,31,17,37,
 19,37,19,41,19,43,19,43,23,47,23,47,23,47,23,53,
 23,53,23,53,29,59,29,61,31,61,31,61,31,67,31,67,
 31,71,31,73,37]