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Old 2020-03-04, 19:02   #2
Stargate38
 
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"Daniel Jackson"
May 2011
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(10^n-666999666999667)/333 is never prime. It's always divisible by 3.

Proof

Last fiddled with by Stargate38 on 2020-03-04 at 19:04 Reason: factordb link
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