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A036379 as a simple table

na(n)
115
215
345
463
585
6123
7153
8255
9323
10511
11603
121023
131139
142047
152227
164095
174369
188189
198777
2016383
2117219
2232767
2333667
2465535
2567591
26131069
27133897
28262143
29264967
30524285
31527621
321048575
331053443

[15,15,45,63,85,123,153,255,323,511,603,1023,1139,
 2047,2227,4095,4369,8189,8777,16383,17219,32767,
 33667,65535,67591,131069,133897,262143,264967,
 524285,527621,1048575,1053443]