id:A070304 - OEIS Search Results

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a(n) = number of times n^2*k^2/(n^2+k^2) is an integer as k ranges over 0, 1, 2, ...

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1, 2, 1, 2, 2, 2, 1, 2, 1, 6, 1, 2, 1, 2, 3, 2, 2, 2, 1, 7, 1, 2, 1, 2, 2, 4, 1, 2, 1, 8, 1, 2, 1, 3, 2, 2, 2, 2, 2, 7, 1, 2, 1, 2, 3, 2, 1, 2, 1, 7, 2, 4, 1, 2, 2, 2, 1, 4, 1, 9, 1, 2, 1, 2, 5, 2, 1, 4, 1, 7, 1, 2, 1, 3, 3, 2, 1, 5, 1, 7, 1, 3, 1, 2, 4, 2, 1, 2, 1, 8, 1, 2, 1, 2, 2, 2, 1, 2, 1, 8, 2, 4, 1, 4, 3 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A018892(n) gives the number of integers of the form nk/(n+k).`
	PROGRAM	`(PARI) for(n=1, 150, print1(sum(i=0, n^2, if((n^2*i^2)%(n^2+i^2), 0, 1)), ", "))`
	CROSSREFS	`Cf. A066451.` `Sequence in context: A164878 A029428 A101422 this_sequence A083952 A043529 A080942` `Adjacent sequences: A070301 A070302 A070303 this_sequence A070305 A070306 A070307`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 10 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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