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A076275
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Numbers of the form (4^{mr}-1)/(4^r-1) for positive integers m, r.
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1
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1, 5, 17, 21, 65, 85, 257, 273, 341, 1025, 1365, 4097, 4161, 4369, 5461, 16385, 21845, 65537, 65793, 69905, 87381, 262145, 266305, 349525, 1048577, 1049601, 1118481, 1398101, 4194305, 5592405, 16777217, 16781313, 16843009, 17043521, 17895697, 22369621
(list; graph; refs; listen; history; internal format)
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