15555...22221 (71-digits)

This number is a prime.

                                                                           1
5555555555 5555555555 5558888888 8888888888 8888882222 2222222222 2222222221

Just showing those entries submitted by 'Patterson': (Click here to show all)

+ A dihedral prime of prime length and prime sum of digits. Note also that each of the digits are repeated a prime number of times. [Patterson]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell