id:A127772 - OEIS Search Results

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Row sums of inverse of number triangle A(n,k)=if(k<=n,if(n<=2k,1/Euler_phi(n+1),0),0).

+0
2

1, 1, 1, 1, 2, -1, 4, -1, 2, 0, 6, -7, 8, -2, 2, -1, 8, -8, 12, -10, 4, 4, 12, -21, 12, 0, 6, -8, 16, -18, 22, -15, 4, 4, 8, -20, 24, -6, 6, -18, 24, -24, 30, -18, 4, 10, 24, -51, 26, -10, 12, -8, 28, -28, 22, -24, 12, 8, 30, -60 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`Row sums of A127771.`
	CROSSREFS	`Sequence in context: A068009 A140168 A059119 this_sequence A086256 A057550 A059150` `Adjacent sequences: A127769 A127770 A127771 this_sequence A127773 A127774 A127775`
	KEYWORD	`sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 28 2007`

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

AT&T Labs Research