A078147 - OEIS

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A078147

First differences of sequence of non-squarefree numbers, A013929.

4, 1, 3, 4, 2, 2, 4, 1, 2, 1, 4, 4, 4, 4, 1, 3, 1, 1, 2, 2, 2, 4, 3, 1, 4, 4, 3, 1, 4, 1, 3, 4, 2, 2, 4, 2, 1, 1, 4, 4, 4, 4, 1, 3, 1, 3, 1, 1, 2, 4, 3, 1, 4, 4, 3, 1, 2, 2, 1, 3, 4, 2, 2, 4, 1, 2, 1, 3, 1, 4, 4, 4, 1, 3, 4, 2, 2, 4, 3, 1, 4, 4, 4, 4, 1, 3, 4, 2, 2, 4, 2, 1, 1, 1, 3, 2, 2, 4, 4, 1, 3, 4, 2, 2, 3 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	FORMULA	`a(n)=A013929[n+1]-A013929[n]`
	EXAMPLE	`a(1)=4=8-4; a(n)-1,2,3 or 4 since n=4k is always non-squarefree.`
	MATHEMATICA	`t=Flatten[Position[Table[MoebiusMu[w], {w, 1, 1000}], 0]]; t1=Delete[RotateLeft[t]-t, -1]`
	CROSSREFS	`Cf. A013929.` `Sequence in context: A061903 A084118 A046071 * A058303 A090724 A134224` `Adjacent sequences: A078144 A078145 A078146 * A078148 A078149 A078150`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 26 2002`

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.