8223335555577777779

This number is a prime.

822333555 5577777779

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The only prime formed by inserting in order between the digits of a double-digit number, all the rep-digit prime-digit numbers using d times each digit d. [Loungrides]

Submitted: 2014-04-18 12:14:55; Last Modified: 2020-11-28 14:57:15.