74747

This number is a prime.

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A prime formed from the two first Carol primes in forward and reverse concatenation. (Carol Primes are of the form 4^k-2^(k+1)-1 = (2^x-1)^2-2.) [Silva]

Submitted: 2009-09-23 00:33:38; Last Modified: 2009-09-23 01:39:30.