A070010 - OEIS

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A070010

GCD of consecutive values of sum-of-proper divisors.

1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 11, 1, 1, 1, 6, 2, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 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, 2, 4, 1, 1, 1, 23, 1, 1, 1, 1, 3, 1, 1, 5, 25, 1, 1, 1, 1, 3, 1, 1, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,9`
	FORMULA	`a(n)=GCD[DivisorSigma[1, n+1]-(n+1), DivisorSigma[1, n]-n]= GCD[A001065(n+1), A001065(n)].`
	CROSSREFS	`Cf. A000203, A001065; GCD of various consecutive function values: A048586, A057467, A058515, A060778, A060780, A069896.` `Sequence in context: A184101 A164561 A178764 * A046564 A046592 A010326` `Adjacent sequences: A070007 A070008 A070009 * A070011 A070012 A070013`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 11 2002`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.