3517
This number is a prime.
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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 15:09:33; Last Modified: 2008-08-31 12:25:37.
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