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A159913 as a simple table

na(n)
01
13
23
37
43
57
67
715
83
97
107
1115
127
1315
1415
1531
163
177
187
1915
207
2115
2215
2331
247
2515
2615
2731
2815
2931
3031
3163
323
337
347
3515
367
3715
3815
3931
407
4115
4215
4331
4415
4531
4631
4763
487
4915
5015
5131
5215
5331
5431
5563
5615
5731
5831
5963
6031
6163
6263
63127
643
657
667
6715
687
6915
7015
7131
727
7315
7415
7531
7615
7731
7831

[1,3,3,7,3,7,7,15,3,7,7,15,7,15,15,31,3,7,7,15,7,
 15,15,31,7,15,15,31,15,31,31,63,3,7,7,15,7,15,15,
 31,7,15,15,31,15,31,31,63,7,15,15,31,15,31,31,63,
 15,31,31,63,31,63,63,127,3,7,7,15,7,15,15,31,7,15,
 15,31,15,31,31]