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A137926 as a simple table

na(n)
11
21
33
44
55
63
77
81
91
105
1111
121
1313
147
1515
1616
1717
181
1919
205
2121
2211
2323
243
2525
2613
2727
287
2929
3015
3131
321
3333
3417
3535
364
3737
3819
3939
405
4141
4221
4343
4411
455
4623
4747
483
4949
5025
5151
5213
5353
5427
5555
567
5757
5829
5959
605
6161
6231
637
6464
6565
6633
6767
6817
6969
7035
7171
721
7373
7437
7525
7619
7777
7839
7979

[1,1,3,4,5,3,7,1,1,5,11,1,13,7,15,16,17,1,19,5,21,
 11,23,3,25,13,27,7,29,15,31,1,33,17,35,4,37,19,39,
 5,41,21,43,11,5,23,47,3,49,25,51,13,53,27,55,7,57,
 29,59,5,61,31,7,64,65,33,67,17,69,35,71,1,73,37,
 25,19,77,39,79]