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The 13th of May 2011 will be a "double Friday the 13th," i.e., the sum of the digits of 5/13/2011 equals 13. The next time this will happen in a prime year is 1/13/2141. [Caldwell]


  Submitted: 2006-10-15 12:03:55;   Last Modified: 2008-01-30 11:19:12.

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