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Prime string of consecutive integers from 20 to 47 whereby the composite numbers are replaced by the sum of their prime factors {9}{10}...{25}{47}. Replacing the composites by the concatenation of these prime factors (counting multiplicity) yields yet another prime of length 80 or {2*2*5}{3*7}...{2*23}{47}. [De Geest]

 

  Submitted: 2003-02-08 22:35:15;   Last Modified: 2008-01-30 11:28:00.



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