13

This number is a prime.

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The number of primes formed by inserting two zeros between the digits of a double-digit number: 1009, 2003, 3001, 4001, 4003, 4007, 5003, 5009, 6007, 7001, 8009, 9001, 9007. [Loungrides]

Submitted: 2019-01-21 18:37:55; Last Modified: 2019-01-21 18:43:20.