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A047740 as a simple table

na(n)
21
32
43
53
64
74
85
95
106
116
126
137
147
158
168
178
189
199
209
2110
2210
2310
2411
2511
2611
2712
2812
2912
3012
3113
3213
3313
3414
3514
3614
3714
3815
3915
4015
4116
4216
4316
4416
4517
4617
4717
4817
4918
5018
5118
5218
5319
5419
5519
5619
5720
5820
5920
6020
6121
6221
6321
6421
6522
6622
6722
6822
6923
7023

[1,2,3,3,4,4,5,5,6,6,6,7,7,8,8,8,9,9,9,10,10,10,
 11,11,11,12,12,12,12,13,13,13,14,14,14,14,15,15,
 15,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,
 19,20,20,20,20,21,21,21,21,22,22,22,22,23,23]