Leroy Quet wrote:
> For which n's is
>
> product{k=1 to n} sigma(k)/d(k)
>
> an integer?
>
> (sigma(k) is sum{j|k} j, and d(k) = sum{j|k} 1.)
>
> Is this sequence in the EIS?
At a quick glance, the only positive integers *not* in the sequence
appear to be 2 and 10. Every other integer up to 5000 is in the
sequence.