id:A070010 - OEIS Search Results

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

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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; listen)

	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: A103524 A110916 A164561 this_sequence A046564 A046592 A010326` `Adjacent sequences: A070007 A070008 A070009 this_sequence A070011 A070012 A070013`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 11 2002`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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