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Old 2020-03-04, 18:28   #1
enzocreti
 
Mar 2018

20E16 Posts
Default Numbers of the form 667, 666999667, 666999666999667...

When these numbers are prime are they always congruent to 15 mod 23?


666999666999667 is prime and 15 mod 23

Last fiddled with by enzocreti on 2020-03-04 at 21:02
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