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A278967 as a simple table

na(n)
12
23
35
47
533
665
717
8513
969
1016385
1131
12262145
131025
14129
15517
1667108865
17536870913
181073741825
198589934593
208449
2173
221027
232199023255553
2489
2516777217

[2,3,5,7,33,65,17,513,69,16385,31,262145,1025,129,
 517,67108865,536870913,1073741825,8589934593,8449,
 73,1027,2199023255553,89,16777217]