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Old 2018-03-15, 11:22   #3
axn
 
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Jun 2003

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Not sure about first, but...
http://www.primenumbers.net/prptop/s...&action=Search

these are of the form a^16384+(a+1)^16384

Last fiddled with by axn on 2018-03-15 at 11:22
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