986474689
This number is a prime.
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The only palindromic prime formed by inserting a prime digit d, (d=7), between the concatenation in descending order of the composite-digit number 9864, consisting of all the composite digits, and its reversal 4689. [Loungrides]
Submitted: 2020-09-10 05:14:05; Last Modified: 2020-10-29 14:41:19.
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