id:A069168 - OEIS Search Results

Search: id:A069168

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Numbers n such that sigma(n)*sum(d|n,1/sigma(d)) is not an integer.

+0
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4, 8, 9, 12, 16, 20, 24, 25, 27, 32, 36, 44, 45, 48, 49, 50, 54, 56, 60, 63, 64, 68, 72, 75, 80, 81, 88, 92, 96, 98, 99, 100, 104, 108, 112, 116, 117, 121, 125, 128, 132, 135, 136, 144, 147, 150, 153, 160, 162, 164, 168, 169, 171, 175, 176, 180, 184, 188, 189, 192 (list; graph; listen)

	OFFSET	`1,1`
	CROSSREFS	`Adjacent sequences: A069165 A069166 A069167 this_sequence A069169 A069170 A069171` `Sequence in context: A122145 A057109 A069189 this_sequence A102211 A119025 A082293`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 09 2002`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

AT&T Labs Research