131

This number is a prime.

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The smallest 3-digit prime that remains prime when inserting one, two or three zeros between its digits, i.e., 10301, 1003001, 100030001 are primes. The other is 577. [Loungrides]

Submitted: 2011-08-24 18:20:30; Last Modified: 2018-10-12 15:44:27.