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A209721 as a simple table

na(n)
13
24
35
47
59
613
717
825
933
1049
1165
1297
13129
14193
15257
16385
17513
18769
191025
201537
212049
223073
234097
246145
258193
2612289
2716385
2824577
2932769
3049153
3165537
3298305
33131073
34196609
35262145
36393217
37524289
38786433
391048577
401572865
412097153
423145729

[3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,
 513,769,1025,1537,2049,3073,4097,6145,8193,12289,
 16385,24577,32769,49153,65537,98305,131073,196609,
 262145,393217,524289,786433,1048577,1572865,
 2097153,3145729]