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A069111
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Squarefree part of 2^n+1 : the smallest number such that a(n)*(2^n+1) is a square.
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0
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3, 5, 1, 17, 33, 65, 129, 257, 57, 41, 2049, 4097, 8193, 16385, 3641, 65537, 131073, 262145, 524289, 1048577, 233017, 4194305, 8388609, 16777217, 33554433, 67108865, 1657009, 268435457, 536870913, 42949673, 2147483649, 4294967297
(list; graph; refs; listen; history; internal format)
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