305017
This number is a prime.
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The first three Fermat primes, when concatenated, form a prime. They also form a prime when concatenated backwards. They also form primes when concatenated forwards or backwards with a 0 inserted between each number. [Hartley]
Submitted: 2003-03-17 09:50:22; Last Modified: 2008-01-30 17:28:00.
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