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Old 2008-09-07, 15:50   #1
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Default False Prime

Has GIMPS ever had a "false prime", one that they thought was prime but proven composite
during the verification process?
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Old 2008-09-07, 16:07   #2
nuggetprime
 
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Yes, once a computer claimed to have found M40, was proven composite during verification. See thread "M40,what went wrong?"

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Old 2008-09-07, 16:29   #3
henryzz
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http://mersenneforum.org/showthread.php?t=672
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