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A260689 as a simple table

na(n)
21
31
43
55
63
77
81
95
107
113
129
133
1413
151
165
1711
1813
193
209
2117
229
2315
2419
255
267
2713
2817
2919
303
3115
3221
339
3415
3525
361
377
3811
3913
4017
4123
429
4315
4421
4527
4629
473
4827
495
507
5117
5223
5325
5431
559
5615
5721
5833
5935
603
6121
6227
6333
641
655
6611
6719
6825
6929
7031
7137
723
7315
7427

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