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

+ 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]

(There is one curio for this number that has not yet been approved by an editor.)

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