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Old 2012-02-03, 21:53   #2
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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There are many.

In particular, there is a couple hundred with a 2^2 * 3 lead - and most of them are at a c111 = ... * c109 (or c110 now?) state due to the bchaffin's workers.
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