100123456789

This number is a prime.

                                                               10 0123456789

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The smallest prime with the pandigital string 0123456789 that remains prime when every pair of adjacent digits are wedged apart by inserting a digit 0: 10000010203040506070809. Note that the latter has a prime number of digits and, in particular, a prime number of 0's. [Beedassy]