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A333871 as a simple table

na(n)
10
21
33
41
55
63
79
81
93
105
1115
123
1315
149
159
161
1717
183
1921
205
2115
2215
2337
243
255
2615
273
289
2937
309
3139
321
3325
3417
3527
363
3739
3821
3927
405
4145
4215
4357
4415
459
4637
4783
483
499
505
5133
5215
5367
543
5545
569
5739
5837
5995
609
6169
6239
6315
641
6551
6625
6791
6817
6959
7027
7197
723
7375
7439

[0,1,3,1,5,3,9,1,3,5,15,3,15,9,9,1,17,3,21,5,15,
 15,37,3,5,15,3,9,37,9,39,1,25,17,27,3,39,21,27,5,
 45,15,57,15,9,37,83,3,9,5,33,15,67,3,45,9,39,37,
 95,9,69,39,15,1,51,25,91,17,59,27,97,3,75,39]