id:A074465 - OEIS Search Results

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a(n)=GCD[n^2, sigma(n^2),phi(n^2)].

+0
2

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 39, 1, 1, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 7, 39, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 7, 11, 1, 1, 1, 1 (list; graph; listen)

	OFFSET	`1,14`
	FORMULA	`a(n)=A74389[n^2]`
	EXAMPLE	`a(n) is odd because sigma[n^2] is odd; n=14:GCD[196,399,84]=7=a(14)`
	MATHEMATICA	`Table[Apply[GCD, {w^2, DivisorSigma[1, w^2], EulerPhi[w^2]}], {w, 1, 128}]`
	CROSSREFS	`Cf. A000005, A000010, A074389.` `Sequence in context: A053878 A070672 A055061 this_sequence A081229 A109010 A117825` `Adjacent sequences: A074462 A074463 A074464 this_sequence A074466 A074467 A074468`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Aug 23 2002`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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