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A171528 as a simple table

na(n)
11
21
33
44
51
61
71
88
99
105
1111
124
1313
147
153
168
1717
189
1919
205
217
2211
2323
242
2525
262
2727
282
2929
302
3131
322
3333
3417
3535
369
3737
3838
3939
4040
4141
427
4343
4444
4545
4646
4747
4812
4949
505
5117
5226
5353
5427
555
5628
5757
5858
5959
605
6161
6231
6321
648
6513
6666
6767
6868
6969
7014

[1,1,3,4,1,1,1,8,9,5,11,4,13,7,3,8,17,9,19,5,7,11,
 23,2,25,2,27,2,29,2,31,2,33,17,35,9,37,38,39,40,
 41,7,43,44,45,46,47,12,49,5,17,26,53,27,5,28,57,
 58,59,5,61,31,21,8,13,66,67,68,69,14]