20122...99999 (48-digits)

This number is a prime.

                        20122333 4444555556 6666677777 7788888888 9999999999

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

The only prime formed by inserting between the digits of a double-digit number n, (n=29), the zero followed in order by all the rep-digit numbers using d times each digit d. [Loungrides]