This number is a prime.
Single Curio View: (Seek other curios for this number)47 is the first and only prime p less than 20000 of the form p*2^(p+1)-1, where p is prime. [Luhn]
Submitted: 2001-09-20 11:48:12; Last Modified: 2008-01-30 11:28:00.
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