30000...00003 (1276-digits)
This number is a prime.
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The concatenation of one three and twenty zeros to the beginning and end of the 12th Fermat number (2^(2^12) + 1) is prime. [Earls]
Submitted: 2004-08-10 13:47:55; Last Modified: 2008-01-30 17:28:00.
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