[math-fun] Magic squares of primes(?)
Fill NxN square with decimal digits such that all rows/columns and 2 main diagonals read primes. Simple(st?) 3x3 case: 227 727 733 with 227,727,733,277,223,773,223 and 727 all primes. Cases with all primes distinct? Larger (largest?) cases? Old hat? zak
Any repunit prime will give a trivial solution. On Fri, Aug 19, 2016 at 12:15 PM, Zak Seidov <math-fun@mailman.xmission.com> wrote:
Fill NxN square with decimal digits such that all rows/columns and 2 main diagonals read primes. Simple(st?) 3x3 case: 227 727 733 with 227,727,733,277,223,773,223 and 727 all primes. Cases with all primes distinct? Larger (largest?) cases? Old hat? zak
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-- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com
http://www.primepuzzles.net/puzzles/puzz_004.htm à+ É. Catapulté de mon aPhone
Le 19 août 2016 à 21:45, Mike Stay <metaweta@gmail.com> a écrit :
Any repunit prime will give a trivial solution.
On Fri, Aug 19, 2016 at 12:15 PM, Zak Seidov <math-fun@mailman.xmission.com> wrote:
Fill NxN square with decimal digits such that all rows/columns and 2 main diagonals read primes. Simple(st?) 3x3 case: 227 727 733 with 227,727,733,277,223,773,223 and 727 all primes. Cases with all primes distinct? Larger (largest?) cases? Old hat? zak
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-- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com
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Thanks, Eric! And of course what I asked was the oldest hat:( zak
Суббота, 20 августа 2016, 0:19 +03:00 от Eric Angelini <Eric.Angelini@kntv.be>:
http://www.primepuzzles.net/puzzles/puzz_004.htm
à+ É. Catapulté de mon aPhone
Le 19 août 2016 à 21:45, Mike Stay < metaweta@gmail.com > a écrit :
Any repunit prime will give a trivial solution.
On Fri, Aug 19, 2016 at 12:15 PM, Zak Seidov < math-fun@mailman.xmission.com > wrote:
Fill NxN square with decimal digits such that all rows/columns and 2 main diagonals read primes. Simple(st?) 3x3 case: 227 727 733 with 227,727,733,277,223,773,223 and 727 all primes. Cases with all primes distinct? Larger (largest?) cases? Old hat? zak
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
-- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com
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participants (3)
-
Eric Angelini -
Mike Stay -
Zak Seidov