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Repunits and bases (
Posted on 20130724
)
11
_{2}
=3 and 111
_{3}
=13 are prime. However, 1111
_{4}
=85=5*17 and 11111
_{5}
=781=11*71 are not prime. What is the least number n>3 such that the repunit consisting of n 1's in base n is prime?
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Submitted by
Math Man
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re: Answer:
 Comment 3 of 6 
(In reply to
Answer:
by broll)
Why is it obvious that x is prime only if n is prime?
Posted by
Charlie
on 20130724 12:42:29
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