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A172989 as a simple table

na(n)
21
32
43
56
65
712
83
92
103
1118
125
1312
143
152
1615
1718
187
1912
2021
212
2263
2342
2455
256
2615
2710
2827
2912
3019
3178
3215
332
3493
3512
365
3778
3815
3910
4021
4112
4223
4318
4457
4514
4627
4730
487
49120
50117
518
5215
5342
5437
5524
5627
5758
5893
5918
607
6112
6275
6338
643
656
667
67132
6827
6928
7069
7118
725
73102
7427
7534
7675
7778
785

[1,2,3,6,5,12,3,2,3,18,5,12,3,2,15,18,7,12,21,2,
 63,42,55,6,15,10,27,12,19,78,15,2,93,12,5,78,15,
 10,21,12,23,18,57,14,27,30,7,120,117,8,15,42,37,
 24,27,58,93,18,7,12,75,38,3,6,7,132,27,28,69,18,5,
 102,27,34,75,78,5]