[seqfan] Re: Number of solutions of a*b + c*d + ... + y*z = 0 (mod n)

Max Alekseyev maxale at gmail.com
Tue Sep 7 11:02:29 CEST 2010

On Mon, Sep 6, 2010 at 2:28 PM, Ron Hardin <rhhardin at att.net> wrote:

> Zeros make the other half of the product free, so you'd be counting
> 0*0 0*1 0*2 0*3 ... as distinct

I don't see a problem with that.

> Instead, to pick up zeros, adding in nonzero results from fewer products seems
> more natural.

Perhaps, both variants should be represented in the OEIS.


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