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A082062

Greatest common prime-divisor of n and Sigma[n]=A000203(n); a(n)=1 if no common prime-divisor was found.

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1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 2, 1, 2, 3, 1, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 7, 1, 3, 1, 1, 3, 2, 1, 1, 1, 2, 1, 5, 1, 3, 1, 2, 3, 2, 1, 2, 1, 1, 3, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 3, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 7, 1, 2, 3, 2, 1, 3, 7, 2, 1, 2, 5, 3, 1, 1, 3, 1, 1, 3, 1, 2, 3 (list; graph; listen)

	OFFSET	`1,6`
	MATHEMATICA	`"factors/exponent SET "; ffi[x_] := Flatten[FactorInteger[x]] lf[x_] := Length[FactorInteger[x]] ba[x_] := Table[Part[ffi[x], 2*w-1], {w, 1, lf[x]}] f1[x_] := x; f2[x_] := DivisorSigma[1, x] Table[Max[Intersection[ba[f1[w]], ba[f2[w]]]], {w, 1, 128}]`
	CROSSREFS	`Cf. A006530, A000203, A082061-A082065.` `Adjacent sequences: A082059 A082060 A082061 this_sequence A082063 A082064 A082065` `Sequence in context: A090751 A030369 A023520 this_sequence A030370 A100808 A010277`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 07 2003`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

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