7001122334455667788999

This number is a prime.

70 0112233445 5667788999

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The only prime formed by inserting the ordered concatenation of all the pairs of identical digits, i.e., 00, 11, …, 99, between the digits of a double-digit prime p, i.e., p=79. [Loungrides]

Submitted: 2022-02-01 12:46:38; Last Modified: 2022-02-01 14:00:45.