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A284631 as a simple table

na(n)
11
21
31
41
51
63
71
81
97
105
113
123
131
145
155
161
171
183
191
207
217
2225
2313
2439
255
267
2715
2813
297
303
311
325
339
343
3525
363
3715
383
395
4027
413
429
433
4415
457
4619
4727
485
4919
507
5117
527
5351
545
553
5627
5729
5877
5927
6017
611
6253
639
643
659
663
679
6831
6923
7027
7139
725
7315
7421
755
763
7729

[1,1,1,1,1,3,1,1,7,5,3,3,1,5,5,1,1,3,1,7,7,25,13,
 39,5,7,15,13,7,3,1,5,9,3,25,3,15,3,5,27,3,9,3,15,
 7,19,27,5,19,7,17,7,51,5,3,27,29,77,27,17,1,53,9,
 3,9,3,9,31,23,27,39,5,15,21,5,3,29]