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A226717 as a simple table

na(n)
13
29
39
425
571
625
767
8427
9427
1067
11181
122393
134671
142393
15181
16491
1713691
1849019
1949019
2013691
21491
221331
2380043
24539703
25977939
26539703
2780043
281331
293607
30469273
316045209
3220577215
3320577215
346045209
35469273
363607
379775
382739433
3967402167

[3,9,9,25,71,25,67,427,427,67,181,2393,4671,2393,
 181,491,13691,49019,49019,13691,491,1331,80043,
 539703,977939,539703,80043,1331,3607,469273,
 6045209,20577215,20577215,6045209,469273,3607,
 9775,2739433,67402167]