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A003976 as a simple table

na(n)
11
21
32
43
52
64
75
82
96
107
113
128
136
144
159
1610
174
186
1911
205
2112
2213
234
2414
2512
266
2715
288
297
3016
3117
326
3310
3418
358
3619
3720
386
3912
4021
418
4222
4312
449
4523
4615
4710
4814
4924
508
5125
5226
536
5427
5528
5611
5729
5816
5910
6018
6120
6212
6318
6430
6513
6631
6721
688
6932
7033
7114
7220
7318
7412
7534
7635
7712
7820

[1,1,2,3,2,4,5,2,6,7,3,8,6,4,9,10,4,6,11,5,12,13,
 4,14,12,6,15,8,7,16,17,6,10,18,8,19,20,6,12,21,8,
 22,12,9,23,15,10,14,24,8,25,26,6,27,28,11,29,16,
 10,18,20,12,18,30,13,31,21,8,32,33,14,20,18,12,34,
 35,12,20]