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Replacing from the left the first digits in 2357 by their partial sums forms a succession of four primes,viz., 2357, 557, 107, 17. Note that the reversals of both semiprimes 2357*557 and 107*17 are prime (9482131, 9181). [Beedassy]

 

  Submitted: 2009-08-21 05:38:38;   Last Modified: 2009-08-21 18:54:11.



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