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A084706 as a simple table

na(n)
03
15
213
317
4113
597
6193
7257
8769
911777
1013313
1159393
1212289
1340961
14114689
1565537
162424833
176946817
18786433
195767169
207340033
2123068673
22155189249
23595591169
241224736769
25167772161
26469762049
272281701377
283489660929
2912348030977
303221225473

[3,5,13,17,113,97,193,257,769,11777,13313,59393,
 12289,40961,114689,65537,2424833,6946817,786433,
 5767169,7340033,23068673,155189249,595591169,
 1224736769,167772161,469762049,2281701377,
 3489660929,12348030977,3221225473]