id:A043305 - OEIS Search Results

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Numbers n such that the numerator of the sum of the reciprocals of the divisors of n (=A017665(n)) is a power of 2.

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1, 3, 6, 7, 15, 21, 28, 31, 33, 42, 69, 84, 91, 93, 105, 127, 135, 141, 186, 217, 231, 270, 273, 285, 381, 420, 465, 483, 496, 546, 573, 651, 762, 775, 819, 861, 868, 889, 924, 945, 987, 1023, 1149, 1185, 1302, 1365, 1419, 1485, 1488, 1561, 1638, 1743, 1890 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A070523 A139247 A124611 this_sequence A072773 A130049 A056703` `Adjacent sequences: A043302 A043303 A043304 this_sequence A043306 A043307 A043308`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 04 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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