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A108688 as a simple table

na(n)
21
31
43
53
63
74
87
97
107
117
127
137
147
157
167
177
187
197
207
217
227
237
247
257
267
277
287
297
307
317
327
337
347
357
3632
3732
3832
3932
4032
4132
4232
4332
4432
4532
4632
4732
4832
4932
5032
5132
5232
5332
5432
5532
5632
5732
5832
5932
6032
6132
6232
6332
6432
6532
6632
6739
6839
6939
7039
7139
7239
7339
7439
7539
7639
7771
7871
7971
8071
8171
8271
8371
8471

[1,1,3,3,3,4,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
 7,7,7,7,7,7,7,7,7,7,32,32,32,32,32,32,32,32,32,32,
 32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
 32,32,32,32,32,39,39,39,39,39,39,39,39,39,39,71,
 71,71,71,71,71,71,71]