99999...99999 (49-digits)

This number is a prime.

                       999999999 8888888877 7777707777 7778888888 8999999999

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

The largest-square congruent prime of order 7 containing three consecutive digits, 2*d times every digit d. [Loungrides]