19 Aug
2016
19 Aug
'16
1:44 p.m.
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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