A082551 - OEIS

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A082551

Denote sigma(n)-n by s(n); a(n)=1 if s(n)>n, a(n)=0 if s(n)=n, a(n)=-1 if s(n)<n.

-1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 0, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, -1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n) = sign( A033880(n) ).`
	MAPLE	`A082551 := proc(n)` `signum( numtheory[sigma](n)-2*n) ;` `end proc: # R. J. Mathar, Sep 28 2011`
	CROSSREFS	`Cf. A001065.` `Sequence in context: A071040 A174340 A071041 * A152614 A127507 A127247` `Adjacent sequences: A082548 A082549 A082550 * A082552 A082553 A082554`
	KEYWORD	`easy,sign`
	AUTHOR	`Hanoch M. bin (hanochb(AT)shiron.com), May 12 2003`

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.