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A139208 as a simple table

na(n)
11
23
37
415
521
631
745
863
993
10105
11127
12189
13217
14255
15315
16341
17455
18511
19819
201023
211365
222047
233591
243855
254095
265461
278191
2812483
2913107
3016383
3121845
3229127
3332767
3453261
3555831
3660787
3765535
3887381
39131071
40178481
41182361
42209715
43258111
44262143
45349525
46430185
47479349
48524287

[1,3,7,15,21,31,45,63,93,105,127,189,217,255,315,
 341,455,511,819,1023,1365,2047,3591,3855,4095,
 5461,8191,12483,13107,16383,21845,29127,32767,
 53261,55831,60787,65535,87381,131071,178481,
 182361,209715,258111,262143,349525,430185,479349,
 524287]