id:A077089 - OEIS Search Results

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Quotients when sigma[n+1]/sigma[n] is integer.

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

	OFFSET	`1,1`
	EXAMPLE	`n=1: sigma[2]/sigma[1]=3/1=3=a(1); n=14: sigma[15]/sigma[14]=24/24=1=a(2); n=5: sigma[6]/1igma[5]=12/6=2=a(3).`
	MATHEMATICA	`Do[s=Mod[a=DivisorSigma[1, n+1], b=DivisorSigma[1, n]]; If[Equal[s, 0], Print[a/b]], {n, 1, 10000000}]`
	CROSSREFS	`Cf. A000203, A002961, A067081, A077086, A077087.` `Sequence in context: A101221 A137241 A016457 this_sequence A096248 A079109 A079099` `Adjacent sequences: A077086 A077087 A077088 this_sequence A077090 A077091 A077092`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Oct 31 2002`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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