id:A077099 - OEIS Search Results

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a(n)=gcd(A051612(n), A065387(n)), where A051612(n) = sigma(n) - phi(n) and A065387(n) = sigma(n) + phi(n).

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2, 2, 2, 1, 2, 2, 2, 1, 1, 2, 2, 8, 2, 6, 16, 1, 2, 3, 2, 2, 4, 2, 2, 4, 1, 6, 2, 4, 2, 16, 2, 1, 4, 2, 24, 1, 2, 6, 16, 2, 2, 12, 2, 8, 6, 2, 2, 4, 3, 1, 8, 2, 2, 6, 16, 48, 4, 2, 2, 8, 2, 6, 4, 1, 12, 4, 2, 2, 4, 24, 2, 3, 2, 6, 4, 8, 12, 48, 2, 2, 1, 2, 2, 8, 4, 6, 16, 20, 2, 6, 8, 4, 4, 2, 48, 4, 2, 3 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`If a(n)=1, then n is either square or twice a square.`
	CROSSREFS	`Cf. A000203, A000010, A051612, A065387.` `Sequence in context: A067597 A139394 A125829 this_sequence A160385 A076881 A136754` `Adjacent sequences: A077096 A077097 A077098 this_sequence A077100 A077101 A077102`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 06 2002`
	EXTENSIONS	`Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Nov 07 2002`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

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