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Old 2020-05-18, 17:41   #3
Batalov
 
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"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

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Welcome, Greg!

The primality of this number can be tested with other tools, pfgw or maybe llr.
observe the webpage - https://primes.utm.edu/primes/page.php?id=130905 and scroll to the lower part (Ctrl-F pfgw); this command line can be replicated on your computer.

And if you really like Prime95, yes, you can test this number for probable-primality (so called PRP test; also note that this also what GeneFer GPU program did, - a PRP test), but after that you still need to test it for strict primality.
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