This number is a prime.

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SUM[i=1..35] {i such that the Woodall number i*2^i - 1 is prime} = 680123 is the largest known prime partial sum of this form (as of January 2010). [Post]

Submitted: 2010-02-01 08:50:21;   Last Modified: 2010-02-01 08:51:09.
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