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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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The first three Fermat primes (3,5,17) form a prime when concatenated forwards or backwards. They also form primes when concatenated forwards or backwards with a zero inserted between each number. [Vouzaxakis and Hartley]


  Submitted: 2002-08-12 10:09:33;   Last Modified: 2008-08-31 07:25:37.

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