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A287274 as a simple table

na(n)
11
23
33
47
511
67
715
851
951
1015
1131
12227
13421
14227
1531
1663
17963
183615
193615
20963
2163
22127
233971
2430517
2559747
2630517
273971
28127
29255
3016131
31252231
32989295
33989295
34252231
3516131
36255
37511
3865027
392054941
4016219187
4132260381
4216219187
432054941
4465027
45511

[1,3,3,7,11,7,15,51,51,15,31,227,421,227,31,63,
 963,3615,3615,963,63,127,3971,30517,59747,30517,
 3971,127,255,16131,252231,989295,989295,252231,
 16131,255,511,65027,2054941,16219187,32260381,
 16219187,2054941,65027,511]