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A147610 as a simple table

na(n)
21
31
43
51
63
73
89
91
103
113
129
133
149
159
1627
171
183
193
209
213
229
239
2427
253
269
279
2827
299
3027
3127
3281
331
343
353
369
373
389
399
4027
413
429
439
4427
459
4627
4727
4881
493
509
519
5227
539
5427
5527
5681
579
5827
5927
6081
6127
6281
6381
64243
651
663
673
689
693
709
719
7227
733
749
759
7627
779
7827
7927
8081
813
829
839
8427
859
8627
8727
8881
899

[1,1,3,1,3,3,9,1,3,3,9,3,9,9,27,1,3,3,9,3,9,9,27,
 3,9,9,27,9,27,27,81,1,3,3,9,3,9,9,27,3,9,9,27,9,
 27,27,81,3,9,9,27,9,27,27,81,9,27,27,81,27,81,81,
 243,1,3,3,9,3,9,9,27,3,9,9,27,9,27,27,81,3,9,9,27,
 9,27,27,81,9]