6143
This number is a prime.
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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]
Submitted: 2014-04-30 19:17:28; Last Modified: 2018-08-19 11:34:55.
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