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A172500 as a simple table

na(n)
11
22
31
44
55
62
77
88
91
1010
111
124
1313
1414
155
1616
1717
182
1919
2020
217
222
2323
248
2525
2626
273
2828
2929
3010
3131
3232
331
3434
3535
364
3737
3838
3913
4040
4141
4214
4343
444
455
4646
4747
4816
4949
5050
5117
5252
5353
546
555
5656
5719
5858
5959
6020
6161
6262
637
6464
6565
662
6767
6868
6923
7070
7171
728
7373
7474
7525

[1,2,1,4,5,2,7,8,1,10,1,4,13,14,5,16,17,2,19,20,7,
 2,23,8,25,26,3,28,29,10,31,32,1,34,35,4,37,38,13,
 40,41,14,43,4,5,46,47,16,49,50,17,52,53,6,5,56,19,
 58,59,20,61,62,7,64,65,2,67,68,23,70,71,8,73,74,
 25]