id:A083209 - OEIS Search Results

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Numbers with exactly one subset of their sets of divisors such that the complement has the same sum.

+0
3

6, 12, 20, 28, 56, 70, 88, 104, 176, 208, 272, 304, 368, 464, 496, 550, 650, 736, 836 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A083206(a(n))=1; perfect numbers (A000396) are a subset; problem: are weird numbers (A006037) a subset?`
	LINKS	`Eric Weisstein's World of Mathematics, Perfect Number.` `Eric Weisstein's World of Mathematics, Weird Number.` `Reinhard Zumkeller, Illustration of initial terms`
	EXAMPLE	`n=20: 2+4+5+10=1+20, 20 is a term (A083206(20)=1).`
	CROSSREFS	`Cf. A005101, A005835, A064771.` `Sequence in context: A094371 A079760 A109895 this_sequence A080714 A116368 A007622` `Adjacent sequences: A083206 A083207 A083208 this_sequence A083210 A083211 A083212`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Apr 22 2003`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.