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A276651 as a simple table

na(n)
21
33
41
51
61
77
81
93
107
1111
121
1313
149
154
161
1717
181
1919
207
211
2231
2323
241
251
2633
273
289
2929
301
3131
321
3341
3437
356
361
3737
3839
3943
407
4141
426
4343
4431
454
4643
4747
481
497
507
5147
5233
5353
541
5561
569
5749
5849
5959
601
6161
6251
631
641
6563
6661
6767
6837
6953
707
7171
721
7373
7457
754
7639

[1,3,1,1,1,7,1,3,7,11,1,13,9,4,1,17,1,19,7,1,31,
 23,1,1,33,3,9,29,1,31,1,41,37,6,1,37,39,43,7,41,6,
 43,31,4,43,47,1,7,7,47,33,53,1,61,9,49,49,59,1,61,
 51,1,1,63,61,67,37,53,7,71,1,73,57,4,39]