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A028234 as a simple table

na(n)
11
21
31
41
51
63
71
81
91
105
111
123
131
147
155
161
171
189
191
205
217
2211
231
243
251
2613
271
287
291
3015
311
321
3311
3417
357
369
371
3819
3913
405
411
4221
431
4411
455
4623
471
483
491
5025
5117
5213
531
5427
5511
567
5719
5829
591
6015
611
6231
637
641
6513
6633
671
6817
6923
7035
711
729
731
7437
7525
7619
7711
7839
791
805
811
8241
831
8421

[1,1,1,1,1,3,1,1,1,5,1,3,1,7,5,1,1,9,1,5,7,11,1,3,
 1,13,1,7,1,15,1,1,11,17,7,9,1,19,13,5,1,21,1,11,5,
 23,1,3,1,25,17,13,1,27,11,7,19,29,1,15,1,31,7,1,
 13,33,1,17,23,35,1,9,1,37,25,19,11,39,1,5,1,41,1,
 21]