99999...22131 (48-digits)

This number is a prime.

                        99999999 9777777755 5553331888 8888866666 6444422131

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The only almost pandigital prime concatenated in descending order from the odd digits followed from the concatenation of the even digits also in descending order using d times each digit d and ending with a 3-digit palindromic prime. [Loungrides]