This number is a prime.

                                                   135 7913579535 9753197531

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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]

Submitted: 2017-05-10 23:14:05;   Last Modified: 2020-06-14 11:40:48.
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