A083533 - OEIS

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A083533

First difference sequence of A002202. Difference between consecutive possible values for phi[n].

1, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 4, 2, 6, 2, 2, 2, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 4, 4, 6, 2, 2, 2, 4, 2, 2, 4, 4, 2, 6, 4, 2, 2, 2, 2, 4, 4, 2, 2, 4, 6, 2, 4, 2, 2, 4, 4, 2, 2, 4, 4, 2, 2, 2, 2, 4, 6, 2, 10, 2, 4, 4, 2, 2, 4, 2, 2, 4, 4, 2, 6, 4, 2, 2, 4, 6, 4, 2, 4 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n)=A002202[n+1]-A02202[n]`
	EXAMPLE	`12 and 16 are the 7th and 8th possible totient values` `12=phi[13],16=phi[17],` `while {13,14,15} are impossible ones;` `thus 16-12=4=a(7)=A002202[8]-A002202[7].`
	MATHEMATICA	`t=Table[EulerPhi[w], {w, 1, 25000}]; u=Union[%]; Delete[u-RotateRight[u], 1]`
	CROSSREFS	`Cf. A000010, A002202, A005277, A083531-A083536, A005277.` `Sequence in context: A064770 A060467 A125918 * A076500 A060594 A104361` `Adjacent sequences: A083530 A083531 A083532 * A083534 A083535 A083536`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 20 2003`

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.