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Old 2004-05-12, 04:34   #3
dswanson
 
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Aug 2002

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I know for certain that the server can and will reissue a doublecheck to the same person turning in the first-time check. I've twice been assigned to doublecheck a number I did the first time around. That's out of over 2000 exponents, which puts the probability around the 0.1% level. And I'm probably an unusual case, since I spent my first few years in GIMPS doing first-time checks, and the past couple doing all doublechecks, which happen to be in the same range first-time checks were a year or two after I started.
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