[seqfan] Numbers with sigma(n)/n a rational power
michel.marcus at free.fr
michel.marcus at free.fr
Sat Nov 2 06:42:48 CET 2013
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 .
Michel
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