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9985*720^2329+1 is prime. Note that 9985 is a Chiliagonal number and 720=6!. Also the sum of digits as well as the sum of squared digits of 9985*720^2329+1 are both prime. [Earls]


  Submitted: 2004-09-03 08:41:35;   Last Modified: 2014-08-09 15:58:22.

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