1709
This number is a prime.
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In the middle of 1709 insert 57 and you get 175709, which is prime. Put two 57's in the middle of 1709 and you get 17575709, which is another prime. Continue this process for a sequence of eight consecutive prime terms.
Submitted: 2004-08-17 10:20:22; Last Modified: 2008-12-20 04:24:59.
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