Thread: 69 * 2^n - 1
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Old 2015-02-17, 10:45   #50
pinhodecarlos
 
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"Carlos Pinho"
Oct 2011
Milton Keynes, UK

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First there was some kind of sieve gap and second they forgot to take out the algebraic factors from k=5.
More in this thread: http://www.mersenneforum.org/showthread.php?t=19170
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