id:A094518 - OEIS Search Results

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Number of pairs (x,y) of divisors of n with x<y such that also x+y is a divisor of n.

+0
4

0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 2, 0, 1, 0, 0, 0, 5, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 6, 0, 0, 0, 2, 0, 3, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0, 1, 0, 0, 0, 12, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 11, 0, 0, 0, 0, 0, 2, 0, 3, 0, 0, 0, 9, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 9, 0, 0, 0, 2, 0, 2 (list; graph; listen)

	OFFSET	`1,12`
	COMMENT	`a(A094519(n)) > 0, a(A094520(n)) = 0.` `a(A097370(n)) = n and a(m) <> n for m<A097370(n).`
	EXAMPLE	`n=30 with divisor set {1,2,3,5,6,10,15,30}: a(30)=4, as 1<2 &` `3=1+2, 1<5 & 6=1+5, 2<3 & 5=2+3, and 5<10 & 15=5+10.`
	CROSSREFS	`Sequence in context: A101856 A059484 A035678 this_sequence A123074 A095269 A111417` `Adjacent sequences: A094515 A094516 A094517 this_sequence A094519 A094520 A094521`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), May 06 2004`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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