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A161818 If b(n) = the largest proper divisor of n, then a(n) = (2^n -1)/(2^b(n) -1). +0
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3, 7, 5, 31, 9, 127, 17, 73, 33, 2047, 65, 8191, 129, 1057, 257, 131071, 513, 524287, 1025, 16513, 2049, 8388607, 4097, 1082401, 8193, 262657, 16385, 536870911, 32769, 2147483647, 65537, 4196353, 131073, 270549121, 262145, 137438953471, 524289 (list; graph; listen)
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.


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