id:A070777 - OEIS Search Results

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a(1) = 1; a(n) = Euler Phi of largest prime-factor of n.

+0
10

1, 1, 2, 1, 4, 2, 6, 1, 2, 4, 10, 2, 12, 6, 4, 1, 16, 2, 18, 4, 6, 10, 22, 2, 4, 12, 2, 6, 28, 4, 30, 1, 10, 16, 6, 2, 36, 18, 12, 4, 40, 6, 42, 10, 4, 22, 46, 2, 6, 4, 16, 12, 52, 2, 10, 6, 18, 28, 58, 4, 60, 30, 6, 1, 12, 10, 66, 16, 22, 6, 70, 2, 72, 36, 4, 18, 10, 12, 78, 4, 2, 40, 82, 6 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=A000010[A006530(n)]`
	EXAMPLE	`n=102=2.3.17: a(102)=phi[17]=16.`
	CROSSREFS	`Cf. A000010, A006530, A068211, A070812.` `Sequence in context: A128861 A057923 A098371 this_sequence A023900 A046791 A125131` `Adjacent sequences: A070774 A070775 A070776 this_sequence A070778 A070779 A070780`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 07 2002`

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Last modified September 7 14:45 EDT 2008. Contains 143483 sequences.

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