Thread: Double-Check
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Old 2016-08-29, 19:15   #2
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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It is prime.
Code:
Using zero-padded FMA3 FFT length 28K, Pass1=448, Pass2=64, a = 3
...
Using zero-padded FMA3 FFT length 30K, Pass1=384, Pass2=80, a = 3
...
U((N+1)/11) is coprime to N!
U((N+1)/3) is coprime to N!
63998*297^21888-1 is prime! (54129 decimal digits, P = 3)  Time : 56.775 sec.
Try -a1 -a2 (etc) options.
Also, try LLR (and optionally, add FFT_Increment=1 (or 2, or 3) to llr.ini
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