A061853 - OEIS

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A061853

Difference between smallest number coprime to n and smallest non-divisor of n.

0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,30`
	COMMENTS	`a(12m+6) is always positive since it involves subtracting 4 from a larger number; the first case where a term not of this form is positive is a(420).`
	FORMULA	`a(n) =A053669(n)-A007978(n).`
	EXAMPLE	`a(29)=2-2=0; a(30)=7-4=3; a(420)=11-8=3.`
	CROSSREFS	`Sequence in context: A169585 A045840 A181000 * A010104 A030121 A062535` `Adjacent sequences: A061850 A061851 A061852 * A061854 A061855 A061856`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), May 10 2001`

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Last modified February 16 15:27 EST 2012. Contains 205930 sequences.