20190402, 15:14  #1 
Aug 2002
20173_{8} Posts 
April 2019

20190403, 13:45  #2 
"Ben"
Feb 2007
2·1,789 Posts 
Easy to find solutions. I wonder what "elegant" looks like for this puzzle; mine surely are not.

20190403, 14:35  #3 
"Ben"
Feb 2007
DFA_{16} Posts 
Found a solution for 4x4

20190403, 14:50  #4 
"Rashid Naimi"
Oct 2015
Remote to Here/There
2^{3}×269 Posts 

20190403, 14:59  #5 
"Ben"
Feb 2007
3578_{10} Posts 

20190403, 15:13  #6 
"Rashid Naimi"
Oct 2015
Remote to Here/There
2^{3}·269 Posts 
Well shouldn't spoil the challenge at this point but there is a simple algorithm as a factor of number of rows as is obvious with the great number of solutions submitted this early.

20190403, 16:46  #7 
"Luke Richards"
Jan 2018
Birmingham, UK
2^{5}×3^{2} Posts 
Thanks for sharing. My year 10 class (aged 1415) had great fun with this today.

20190403, 17:55  #8 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2×7×11×31 Posts 
Yes quite easy indeed.
...

20190407, 20:36  #9 
"Rashid Naimi"
Oct 2015
Remote to Here/There
2^{3}×269 Posts 
Well, I did a 101x101 matrix because I found it interesting to write a code to generate a code to solve the large matrix. Otherwise it would have been prohibitively too much work to type the code to check all the 101+101+2 averages.
ETA Again, I wished someone would write a "foreach" style function for the PARIGP vectors/matrices or add a few decent numeric examples to the forvec loop documentation. Last fiddled with by a1call on 20190407 at 20:59 
20190408, 15:01  #10 
Romulan Interpreter
"name field"
Jun 2011
Thailand
10011001000101_{2} Posts 

20190409, 13:35  #11 
"Ben"
Feb 2007
2×1,789 Posts 

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