17
This number is a prime.
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The Lo Shu (雒書) is a unique magic square that contains exactly 17 primes according to word search rules. Can you find them all? [Honaker]
Submitted: 2018-04-17 19:39:38; Last Modified: 2018-04-18 21:31:24.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell