6711713

This number is a prime.

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Prime string of five consecutive integers from 9 to 13 whereby the composite numbers are replaced by the sum of their prime factors {6}{7}{11}{7}{13}. Replacing the composites by the concatenation of these prime factors (counting multiplicity) yields yet another prime 33251122313 or {3*3}{2*5}{11}{2*2*3}{13}. [De Geest]

Submitted: 2003-02-09 03:48:14; Last Modified: 2008-01-30 17:28:00.