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Old 2015-01-02, 17:52   #6
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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I think about A), and possibly redirecting the CPU power into the soon to emerge "Cyclo"tomic-based project. It is similar to F)+H), and indeed, only focuses on numbers for which special FFT exists.

Initially, it will probably be on PrimeGrid's PRPnet, as most budding projects are. I can provide my LLR implementation for their CPU participants, and Cyclo is OpenCL so it will run on any modern* GPU.
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*this excludes only very old and cheap cards that don't have double float.
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