id:A076686 - OEIS Search Results

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a(n)=min(core(n),phi(n)) where core(n) is the squarefree part of n.

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1, 1, 2, 1, 4, 2, 6, 2, 1, 4, 10, 3, 12, 6, 8, 1, 16, 2, 18, 5, 12, 10, 22, 6, 1, 12, 3, 7, 28, 8, 30, 2, 20, 16, 24, 1, 36, 18, 24, 10, 40, 12, 42, 11, 5, 22, 46, 3, 1, 2, 32, 13, 52, 6, 40, 14, 36, 28, 58, 15, 60, 30, 7, 1, 48, 20, 66, 17, 44, 24, 70, 2, 72, 36, 3, 19, 60, 24, 78, 5 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`sum(k=1, n, a(k)) is asymptotic to c*n^2 with c=0.239......`
	PROGRAM	`(PARI) a(n)=min(core(n), eulerphi(n))`
	CROSSREFS	`Sequence in context: A125131 A003958 A082729 this_sequence A114810 A093819 A089929` `Adjacent sequences: A076683 A076684 A076685 this_sequence A076687 A076688 A076689`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 25 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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