7776665554443332221111

This number is a prime.

                                                    77 7666555444 3332221111

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

Three 7's, followed by three 6's, followed by three 5's, followed by three 4's, followed by three 3's, followed by three 2's, followed by three 1's, followed by a 1 is prime. [Patterson]