12333...33321 (49-digits)

This number is a prime.

123334555 5567777777 8999999999 8777777765 5555433321

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Palindromic prime formed from the nine digits in increasing and decreasing order with the odd digits repeated d times. [Silva]

Submitted: 2020-06-25 11:51:29; Last Modified: 2020-06-25 12:32:10.