DivisorSigma[1, n] < (6/Pi^2) n Sqrt[n] /; n >= 9

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<math xmlns='http://www.w3.org/1998/Math/MathML' mathematica:form='TraditionalForm' xmlns:mathematica='http://www.wolfram.com/XML/'> <semantics> <mrow> <mrow> <mrow> <msub> <semantics> <mi> &#963; </mi> <annotation encoding='Mathematica'> TagBox[&quot;\[Sigma]&quot;, DivisorSigma] </annotation> </semantics> <mn> 1 </mn> </msub> <mo> ( </mo> <mi> n </mi> <mo> ) </mo> </mrow> <mo> &lt; </mo> <mrow> <mfrac> <mn> 6 </mn> <msup> <mi> &#960; </mi> <mn> 2 </mn> </msup> </mfrac> <mo> &#8290; </mo> <mi> n </mi> <mo> &#8290; </mo> <msqrt> <mi> n </mi> </msqrt> </mrow> </mrow> <mo> /; </mo> <mrow> <mi> n </mi> <mo> &#8805; </mo> <mn> 9 </mn> </mrow> </mrow> <annotation-xml encoding='MathML-Content'> <apply> <ci> Condition </ci> <apply> <lt /> <apply> <ci> DivisorSigma </ci> <cn type='integer'> 1 </cn> <ci> n </ci> </apply> <apply> <times /> <apply> <times /> <cn type='integer'> 6 </cn> <apply> <power /> <apply> <power /> <pi /> <cn type='integer'> 2 </cn> </apply> <cn type='integer'> -1 </cn> </apply> </apply> <ci> n </ci> <apply> <power /> <ci> n </ci> <cn type='rational'> 1 <sep /> 2 </cn> </apply> </apply> </apply> <apply> <geq /> <ci> n </ci> <cn type='integer'> 9 </cn> </apply> </apply> </annotation-xml> </semantics> </math>

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2002-12-18