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A139171 as a simple table

na(n)
12
22
33
45
55
63
77
85
97
105
1111
125
1313
147
155
167
1717
187
1919
205
217
2211
2323
245
2511
2613
2711
287
2929
305
3131
3211
3311
3417
357
367
3737
3819
3913
405
4141
427
4343
4411
457
4623
4747
487
4917
5011
5117
5213
5353
5411
5511
567
5719
5829
5959
605
6161
6231
637
6411
6513
6611
6767
6817
6923
707
7171
727
7373
7437
7511
7619
7711
7813
7979
807
8111

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