id:A091009 - OEIS Search Results

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Number of triples (u,v,w) of divisors of n with v-u = w-v.

+0
6

0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 1, 0, 0, 2, 0, 0, 0, 0, 0, 5, 0, 0, 0, 1, 0, 4, 0, 0, 0, 0, 0, 6, 0, 0, 0, 1, 0, 2, 0, 0, 3, 0, 0, 7, 0, 0, 0, 0, 0, 3, 0, 2, 0, 0, 0, 11, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 10, 0, 0, 2, 0, 0, 2, 0, 2, 0, 0, 0, 9, 0, 0, 0, 0, 0, 10, 1, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,12`
	COMMENT	`a(A091014(n))=n and a(m)<>n for m<=A091014(n);` `a(A091010(n))=0; a(A091011(n))>0; a(A091012(n))=1; a(A091013(n))>1.`
	EXAMPLE	`a(30)=4, as there are exactly 4 triples of divisors with the defining property: (1,2,3), (1,3,5), (2,6,10) and (5,10,15).`
	CROSSREFS	`Sequence in context: A057387 A109898 A092573 this_sequence A167163 A005890 A104515` `Adjacent sequences: A091006 A091007 A091008 this_sequence A091010 A091011 A091012`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 13 2003`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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