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Old 2010-07-13, 10:16   #10
kar_bon
 
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Mar 2006
Germany

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Graph of all primes of the form k*2^n-1 with 1 <= k <= 10000 and 1 <= n <= 3,000,000 in the Database as of 2010-07-11: 123,139 counting.

18 primes with n>3,000,000 are not shown here.
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