[seqfan] Re: [math-fun] EXACT matrix factorizations
W. Edwin Clark
wclark at mail.usf.edu
Tue May 7 20:17:36 CEST 2013
Brute force gives the following for a(n) = number of squares in M(n,2) =
ring of nxn matrices over GF(2),
beginning with n = 1:
2,10,260,31096
which is not in the OEIS. Perhaps some interested soul can extend this.
On Tue, May 7, 2013 at 1:08 PM, Neil Sloane <njasloane at gmail.com> wrote:
> That's related to several questions that have interested me for decades.
> Here's a simple version: choose your favorite matrix ring R,
> e.g. real matrices with entries that are 0 or 1.
> What is a(n) := number of nxn matrices in R that have a square root in R?
>
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