2357

This number is a prime.

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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 10:38:38; Last Modified: 2009-08-21 23:54:11.