9967

This number is a prime.

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The largest 4-digit left-truncatable prime (emirp). It is also the largest four-digit deletable emirp. Deleting one digit at a time, we take a prime at each step, i.e., 967, 97, 7. Note that 967, 97 are also emirps. [Loungrides]

Submitted: 2009-05-04 10:29:51; Last Modified: 2009-05-04 22:11:57.