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A165959 as a simple table

na(n)
12
23
35
45
55
611
73
87
93
109
115
1211
137
149
157
1611
1715
1813
1927
2025
2121
2215
2313
2411
255
2617
277
283
2911
309
3115
329
3321
3413
353
3615
3713
387
395
4015
4111
4211
4317
4415
4527
4621
4715
4813
497
5021
5119
5215
539
543
5517
5615
577
587
597
609
619
6217
6315
6411
659
665
675
6821
6917
7011
717
7215
739

[2,3,5,5,5,11,3,7,3,9,5,11,7,9,7,11,15,13,27,25,
 21,15,13,11,5,17,7,3,11,9,15,9,21,13,3,15,13,7,5,
 15,11,11,17,15,27,21,15,13,7,21,19,15,9,3,17,15,7,
 7,7,9,9,17,15,11,9,5,5,21,17,11,7,15,9]