11122...89991 (31-digits)

This number is a prime.

                                          1 1122200033 3444555666 7778889991

+ 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]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell