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A111618 as a simple table

na(n)
21
33
42
55
63
77
84
99
1010
1111
126
1313
1414
1515
168
1717
189
1919
2010
2121
2211
2323
2412
2525
2626
2727
2814
2929
3030
3131
3216
3333
3417
3535
3618
3737
3838
3939
4020
4141
4242
4343
4422
4545
4646
4747
4848
4949
5050
5151
5252
5353
5427
5555
5656
5757
5829
5959
6030
6161
6231
6363
6432
6565
6666
6767
6834
6969
7070
7171
7272
7373
7474

[1,3,2,5,3,7,4,9,10,11,6,13,14,15,8,17,9,19,10,21,
 11,23,12,25,26,27,14,29,30,31,16,33,17,35,18,37,
 38,39,20,41,42,43,22,45,46,47,48,49,50,51,52,53,
 27,55,56,57,29,59,30,61,31,63,32,65,66,67,34,69,
 70,71,72,73,74]