88888...32211 (37-digits)

This number is a prime.

                                    8888888 8777777766 6666555554 4443332211

+ The concatenation in descending order of first eight positive digits using d times each digit d and then followed by 1 is prime. [Loungrides]

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