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A085903 as a simple table

na(n)
11
21
37
49
531
649
7127
8225
9511
10961
112047
123969
138191
1416129
1532767
1665025
17131071
18261121
19524287
201046529
212097151
224190209
238388607
2416769025
2533554431
2667092481
27134217727
28268402689
29536870911
301073676289
312147483647

[1,1,7,9,31,49,127,225,511,961,2047,3969,8191,
 16129,32767,65025,131071,261121,524287,1046529,
 2097151,4190209,8388607,16769025,33554431,
 67092481,134217727,268402689,536870911,1073676289,
 2147483647]