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A111609 as a simple table

na(n)
11
22
33
41
55
63
77
87
99
1010
1111
1212
1313
147
1515
1610
1717
1818
1919
2015
2121
2211
2323
249
2525
2626
2727
2814
2929
3015
3131
324
3333
3434
3535
369
3737
3819
3939
4035
4141
4242
4343
4444
4545
4623
4747
4830
4949
5050
5151
5239
5353
5427
5555
5621
5757
5858
5959
6030
6161
6231
6363
648
6565
6666
6767
6817
6969
7035
7171
7263
7373
7474
7575

[1,2,3,1,5,3,7,7,9,10,11,12,13,7,15,10,17,18,19,
 15,21,11,23,9,25,26,27,14,29,15,31,4,33,34,35,9,
 37,19,39,35,41,42,43,44,45,23,47,30,49,50,51,39,
 53,27,55,21,57,58,59,30,61,31,63,8,65,66,67,17,69,
 35,71,63,73,74,75]