A067541 - OEIS

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A067541

phi(n*(n+1)/2)/phi(n) where phi is the Euler totient function A000010(n).

1, 2, 1, 2, 2, 6, 2, 3, 4, 10, 2, 6, 6, 8, 4, 8, 6, 18, 4, 6, 10, 22, 4, 10, 12, 18, 6, 14, 8, 30, 8, 10, 16, 24, 6, 18, 18, 24, 8, 20, 12, 42, 10, 12, 22, 46, 8, 21, 20, 32, 12, 26, 18, 40, 12, 18, 28, 58, 8, 30, 30, 36, 16, 24, 20, 66, 16, 22, 24, 70, 12, 36, 36, 40, 18, 30, 24 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`Let n=2^k*l, GCD(l, 2)=1, then a(n)=phi((n+1)/2) if k=0, phi(n+1) if k=1 and phi(n+1)/2 if k>1. - Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 06 2002`
	CROSSREFS	`Sequence in context: A095291 A093659 A200745 * A054706 A081727 A000020` `Adjacent sequences: A067538 A067539 A067540 * A067542 A067543 A067544`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 28 2002`

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Last modified February 17 23:58 EST 2012. Contains 206085 sequences.