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Old 2019-01-03, 03:20   #3
P90 years forever!
Prime95's Avatar
Aug 2002
Yeehaw, FL

22·1,873 Posts

Check here to make sure it has no known factors:

If the exponent is large, say above 200,000,000 expect a really long run time. Also consider doing a PRP test (better error checking) rather than an LL test.
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