5
This number is a prime.
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The smallest odd prime Thabit number. Arab mathematician Thabit ibn Qurra discovered a rule for finding amicable pairs based on these numbers (of the form 3 * 2n - 1) before his death in Baghdad in 901.
Submitted: 2003-10-31 21:12:44; Last Modified: 2009-03-29 02:33:01.
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