11122...89991 (31-digits)

This number is a prime.

1 1122200033 3444555666 7778889991

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The smallest prime, beginning and ending with the same digit, formed from the concatenation of all the repdigit numbers, each consisting of 3 digits d. [Loungrides]

Submitted: 2019-07-29 11:13:37; Last Modified: 2019-07-29 11:37:22.