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A361438 as a simple table

na(n)
11
21
33
41
57
61
73
85
915
101
1131
121
133
147
159
1621
1763
181
19127
201
213
225
2315
2417
2551
2685
27255
281
297
3073
31511
321
333
3411
3531
3633
3793
38341
391023
401
4123
4289
432047
441
453
465
477
489
4913
5015
5121
5235
5339
5445
5563
5665
5791
58105
59117
60195
61273
62315
63455
64585
65819
661365
674095
681
698191
701
713
7243
73127
74129
75381
765461
7716383

[1,1,3,1,7,1,3,5,15,1,31,1,3,7,9,21,63,1,127,1,3,
 5,15,17,51,85,255,1,7,73,511,1,3,11,31,33,93,341,
 1023,1,23,89,2047,1,3,5,7,9,13,15,21,35,39,45,63,
 65,91,105,117,195,273,315,455,585,819,1365,4095,1,
 8191,1,3,43,127,129,381,5461,16383]