88888...32211 (37-digits)

This number is a prime.

                                    8888888 8777777766 6666555554 4443332211

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

+ The concatenation in descending order of first eight positive digits using d times each digit d and then followed by 1 is prime. [Loungrides]

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