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Old 2014-02-03, 08:19   #2
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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It would have been better to chose a>1290000*log102 for 10^a-10^k-1. With a=360360, the found primes will be swept away in about a year by the TwinGen-ial deluge. a=17#, perhaps?
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