[seqfan] Re: Numbers with sigma(n)/n a rational power
jfb at brennen.net
Sat Nov 2 16:35:41 CET 2013
Is it possible? Sure thing!
sigma(n)/n == (6/5)^9 :
On 11/1/2013 10:42 PM, michel.marcus at free.fr wrote:
> Hello seqfans,
> In OEIS, A069070 lists some numbers for which sigma(n)/n is a square.
> And A230043 lists some numbers for which sigma(n)/n is a cube.
> Finally, A230538 lists some numbers for which sigma(n)/n is a fourth power.
> And it also gives instances for powers from 5 to 8.
> Is it possible to find instances with higher power like 9 or 10?
> Best .
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