13579135795359753197531

This number is a prime.

                                                   135 7913579535 9753197531

+ The smallest odd-digit palindromic prime that consists of two times the concatenation in increasing order of the odd digits, 13579, a palindrome, 535 in the middle, and two times the concatenation in decreasing of the odd digits, 97531. [Loungrides]

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