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A270836 as a simple table

na(n)
13
25
39
411
517
633
765
8129
9231
10257
11513
121025
132049
144097
158193
1616385
1732769
1865537
19119831
20131073
21262145
22524289
231048577
242097153
254194305
268388609
2716777217
2833554433
2967108865
30134217729
31268435457
32536870913
331073741825
342147483649
354294967297

[3,5,9,11,17,33,65,129,231,257,513,1025,2049,4097,
 8193,16385,32769,65537,119831,131073,262145,
 524289,1048577,2097153,4194305,8388609,16777217,
 33554433,67108865,134217729,268435457,536870913,
 1073741825,2147483649,4294967297]