This number is a prime.
Single Curio View: (Seek other curios for this number)The smallest prime such that another prime is never produced by inserting the same digit between each pair of its digits (40309, 41319, 42329, ... , 49399, are all composite). [Noll]
Submitted: 2006-10-17 11:00:44; Last Modified: 2008-07-24 19:39:10.
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