id:A078595 - OEIS Search Results

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Number of pairs (x,y) 1<=x<=y<=n such that 1/x+1/y+1/n = 1/2.

+0
1

0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; listen)

	OFFSET	`1,12`
	FORMULA	`It seems that for n>=43 a(n) = 0`
	PROGRAM	`(PARI) a(n)=sum(i=1, n, sum(j=1, i, if(1/i+1/j+1/n-1/2, 0, 1)))`
	CROSSREFS	`Adjacent sequences: A078592 A078593 A078594 this_sequence A078596 A078597 A078598` `Sequence in context: A015692 A016232 A007949 this_sequence A078128 A112607 A091970`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 08 2002`

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

AT&T Labs Research