Thread: Fun Sequence
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Old 2013-02-07, 11:16   #2
axn's Avatar
Jun 2003

22·7·193 Posts

Your expression simplifies to k.n.n!+1. Why not ditch the extra n and search for k.n!+1? Anyways...

Are you doing any sieving?

I am not aware of anything faster than regular PRP tests (PFGW can do that). PFGW can also prove the primality with a -tm argument.
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