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A081521 as a simple table

na(n)
11
21
33
41
54
67
71
83
95
107
111
122
133
146
158
161
175
187
1911
2013
2117
221
232
243
254
265
278
2812
291
303
315
327
339
3411
3513
3615
371
382
394
405
417
428
4310
4413
4522
461
473
487
499
5011
5113
5217
5319
5421
5529
561
572
583
594
605
616
627
638
649
6512
6620

[1,1,3,1,4,7,1,3,5,7,1,2,3,6,8,1,5,7,11,13,17,1,2,
 3,4,5,8,12,1,3,5,7,9,11,13,15,1,2,4,5,7,8,10,13,
 22,1,3,7,9,11,13,17,19,21,29,1,2,3,4,5,6,7,8,9,12,
 20]