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A220221 as a simple table

na(n)
11
23
35
47
59
617
723
833
965
10129
11257
12513
131025
142049
154097
168193
1716385
1832769
1965537
20131073
21262145
22524289
231048577
242097153
254194305
268388609
2716777217
2833554433
2967108865
30134217729
31268435457
32536870913
331073741825
342147483649
354294967297

[1,3,5,7,9,17,23,33,65,129,257,513,1025,2049,4097,
 8193,16385,32769,65537,131073,262145,524289,
 1048577,2097153,4194305,8388609,16777217,33554433,
 67108865,134217729,268435457,536870913,1073741825,
 2147483649,4294967297]