[seqfan] nXn Binary Matrices Squared Still Binary

Brendan McKay bdm at cs.anu.edu.au
Mon Jun 18 03:40:02 CEST 2012

A122527 is pretty useless without a proper definition, but it 
is plausible that they are not defined the same. A122527 could
be a finite sequence that ends with a square matrix. I can
imagine that an n*n matrix defined as in A121231 might be
represented by some 7*n matrix if n<=7, though no specific
method comes to mind.


> Date: Sun, 17 Jun 2012 04:39:57 -0700 (PDT)
> From: Ron Hardin <rhhardin at att.net>
> To: seqfan at list.seqfan.eu
> Subject: [seqfan] nXn Binary Matrices Squared Still Binary
> Message-ID:
> 	<1339933197.46923.YahooMailRC at web180310.mail.gq1.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
> http://oeis.org/search?q=id:A121231|id:A122527 appear to be the same series, the 
> latter just with incorrect title
> The next term A121231(7) comes out 17080038508 , matching A122527
>  rhhardin at mindspring.com
> rhhardin at att.net (either)

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