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A171253 as a simple table

na(n)
15
217
319
465
567
679
74097
84099
94111
104159
1165537
1265539
1365551
1465599
1569631
16262145
17262147
18262159
19262207
20266239
21327679
221073741825
231073741827
241073741839
251073741887
261073745919
271073807359
281074003967

[5,17,19,65,67,79,4097,4099,4111,4159,65537,65539,
 65551,65599,69631,262145,262147,262159,262207,
 266239,327679,1073741825,1073741827,1073741839,
 1073741887,1073745919,1073807359,1074003967]