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A088032 as a simple table

na(n)
13
23
39
43
533
631
7129
831
9513
10511
112049
121023
138193
148191
1532769
164095
17131073
18131071
19524289
20262143
212097153
222097151
238388609
242097151

[3,3,9,3,33,31,129,31,513,511,2049,1023,8193,8191,
 32769,4095,131073,131071,524289,262143,2097153,
 2097151,8388609,2097151]