1311
This number is a composite.
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The concatenation of the first and second primes multiplied
by the concatenation of the third and fourth primes equals
the concatenation of the fifth and sixth primes in reverse
order: 23 * 57 = 1311. [Homewood]
Submitted: 2011-03-02 09:56:23; Last Modified: 2025-11-20 04:35:25.
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