Prime Curios!: 3517

3517
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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.