7331

This number is a prime.

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The largest of only three right-truncatable primes, each formed by concatenating two double-digit emirps. The other two are 3137 and 3797. Note that 7331 is the only right-truncatable prime concatenated in descending order from two double-digit emirps. [Loungrides]

Submitted: 2018-02-24 08:57:55; Last Modified: 2018-03-08 00:05:01.