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A375849 as a simple table

na(n)
21
31
43
53
61
71
87
97
101
111
125
135
1411
1511
1615
1715
183
193
201
219
2219
2319
243
253
2623
2723
2825
2925
307
317
3231
3331
3415
3515
3617
3717
3835
3935
409
419
4239
4339
4441
4541
4621
4721
483
493
5047
5147
5249
5349
543
5513
5653
5753
5827
5927
609
619
6257
6357
6463
6563
6631
6731
6831
6915
7067
7167
7211
7311

[1,1,3,3,1,1,7,7,1,1,5,5,11,11,15,15,3,3,1,9,19,
 19,3,3,23,23,25,25,7,7,31,31,15,15,17,17,35,35,9,
 9,39,39,41,41,21,21,3,3,47,47,49,49,3,13,53,53,27,
 27,9,9,57,57,63,63,31,31,31,15,67,67,11,11]