id:A071804 - OEIS Search Results

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

+0
1

0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 (list; graph; listen)

	OFFSET	`1,9`
	PROGRAM	`(PARI) for(n=1, 130, print1(sum(i=1, n, sum(j=1, n, if(numdiv(i^j)-i-j, 0, 1))), ", "))`
	CROSSREFS	`Cf. A000005.` `Sequence in context: A003074 A067100 A074802 this_sequence A111894 A025845 A029393` `Adjacent sequences: A071801 A071802 A071803 this_sequence A071805 A071806 A071807`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 06 2002`

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

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