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The center of a 7-by-7 magic square of primes which stays a magic square (but with 7 primes) if the units digits of all entries are removed (i.e., 9341 becomes 934, ...). [Madachy]


  Submitted: 2008-03-16 08:28:50;   Last Modified: 2009-07-20 06:05:24.

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