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The prime factors of 1234567 (127 * 9721) form a peak-palindromic arrangement of digits (1279721). It is curious that the prime factors of 1279721 are all three emirps (79 * 97 * 167) which upon concatenation form yet another prime (7997167). [Trotter]

 

  Submitted: 2001-06-24 18:48:29;   Last Modified: 2009-01-18 22:46:15.



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