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A168288 as a simple table

na(n)
01
11
21
31
45
51
61
715
815
91
101
1137
1287
1337
141
151
1683
17373
18373
1983
201
211
22177
231389
242609
251389
26177
271
281
29367
304791
3115263
3215263
334791
34367
351
361
37749
3815787
3980285
40134647
4180285
4215787
43749
441
451
461515
4750529
48393657
491033401
501033401
51393657
5250529

[1,1,1,1,5,1,1,15,15,1,1,37,87,37,1,1,83,373,373,
 83,1,1,177,1389,2609,1389,177,1,1,367,4791,15263,
 15263,4791,367,1,1,749,15787,80285,134647,80285,
 15787,749,1,1,1515,50529,393657,1033401,1033401,
 393657,50529]