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A283091 as a simple table

na(n)
23
37
415
531
663
7127
8217
9511
101023
112047
123255
138001
1411811
1532767
1663457
17131071
18262143
19520065
201048575
212097151
224194303
238388607
2416766977
2533554431
2667074049
27133693185
28268435455
29536870911
301073215489
312147483647
324292868097
338589934591
3417179312129

[3,7,15,31,63,127,217,511,1023,2047,3255,8001,
 11811,32767,63457,131071,262143,520065,1048575,
 2097151,4194303,8388607,16766977,33554431,
 67074049,133693185,268435455,536870911,1073215489,
 2147483647,4292868097,8589934591,17179312129]