3467
This number is a prime.
The number 3467 and its reversal are the only four-digit left-truncatable emirps with left-truncatable reversal. [Punches]
The smallest emirp containing all distinct digits n for
which n!-1 is a factorial prime. [Loungrides]
The smallest distinct-digit 4-digit emirp whose the complementary digits create its emirp, i.e., 7643. Is there another such prime? [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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