2293
This number is a prime.
The smallest number k for which there is no known prime of the form k*2n-1.
In the fictional Star Trek universe, the location of Rigel in the Milky Way Galaxy was first depicted on a Federation star chart in 2293.
The smallest of three primes each formed by inserting a double-digit prime between the digits of its previous prime. The other two are 3371 and 8893. [Loungrides]
(There are 3 curios for this number that have not yet been approved by an editor.)
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