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A026413 as a simple table

na(n)
21
32
44
54
66
77
89
99
1011
1113
1213
1316
1415
1515
1619
1719
1819
1925
2021
2122
2227
2332
2432
2529
2634
2732
2831
2941
3037
3136
3236
3337
3448
3540
3647
3743
3844
3945
4046
4145
4251
4350
4449
4559
4663
4751
4851
4965
5055
5159
5269
5370
5471
5568
5674
5773
5886
5968
6074
6175
6285
6382
6490
6595
6677
6779
6883
6982
7080
7179
7289
7390

[1,2,4,4,6,7,9,9,11,13,13,16,15,15,19,19,19,25,21,
 22,27,32,32,29,34,32,31,41,37,36,36,37,48,40,47,
 43,44,45,46,45,51,50,49,59,63,51,51,65,55,59,69,
 70,71,68,74,73,86,68,74,75,85,82,90,95,77,79,83,
 82,80,79,89,90]