6143

This number is a prime.

+ The only 4-digit prime Thabit number, i.e., a prime of form 3*2^n-1, (case n=11). Note that 11 is also a prime Thabit number for n=2, and 2 is also a prime Thabit number for n=0). [Loungrides]

(There is one curio for this number that has not yet been approved by an editor.)

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