id:A078147 - OEIS Search Results

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First differences of sequence of non-square-free numbers, A013929.

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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; listen)

	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-square-free.`
	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 this_sequence A058303 A090724 A134224` `Adjacent sequences: A078144 A078145 A078146 this_sequence A078148 A078149 A078150`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 26 2002`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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