41

This number is a prime.

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A prime number of length 41 can be constructed by concatenating the exponents of the first consecutive Mersenne primes, separated by 0's. (Hint: the number of exponents used is the reversal of 41.) [Hartley]

Submitted: 2006-07-25 20:59:34; Last Modified: 2009-02-15 04:15:27.