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A171530 as a simple table

na(n)
11
21
31
41
55
63
77
84
93
105
1111
123
1313
147
155
1616
1717
182
1919
202
2121
222
2323
2424
2525
2626
279
287
2929
3015
3131
3216
3311
3434
357
3612
3737
3819
3939
405
4141
4221
4343
4422
455
4623
4747
488
4949
5050

[1,1,1,1,5,3,7,4,3,5,11,3,13,7,5,16,17,2,19,2,21,
 2,23,24,25,26,9,7,29,15,31,16,11,34,7,12,37,19,39,
 5,41,21,43,22,5,23,47,8,49,50]