69999...32211 (47-digits)

This number is a prime.

                         6999999 9998888888 8777777766 6666555554 4443332211

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 prime p, the concatenation in descending order of all the digits d times each digit d, i.e., case p=61. [Loungrides]

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