23571...39689 (56-digits)

This number is a prime.

235713 1719316189 1071275216 0712792203 2281321742 5344239689

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The concatenation of the exponents of the first 21 Mersenne primes yields this prime number. [Hartley]

Submitted: 2003-03-17 09:40:17; Last Modified: 2008-01-30 17:28:00.