id:A049586 - OEIS Search Results

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GCD of cototients(A051953) of pairs of consecutive integers.

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1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 3, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 3, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3 (list; graph; listen)

	OFFSET	`0,9`
	FORMULA	`a(n) = GCD[w+1-Phi[w+1], w-Phi[w]] = GCD[A051953(w+1), A051953(w)] Most of the terms are 1.`
	EXAMPLE	`n = 9: a(9) = GCD[10-Phi(10), 9-Phi(9)] = GCD[6, 3] = 3. n = 10: a(10) = GCD[11-Phi(11), 10-Phi(10)] = GCD[1, 6] = 1`
	CROSSREFS	`Cf. A000010, A051953, A058515.` `Sequence in context: A030578 A030577 A070670 this_sequence A133721 A083202 A030560` `Adjacent sequences: A049583 A049584 A049585 this_sequence A049587 A049588 A049589`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Dec 28 2000`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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