14098Re: Primes of the form (n^n-1)/(n-1)
- Nov 30, 2003--- In firstname.lastname@example.org, "julienbenney" <jpbenney@f...>
> Moving away from prime quadruples, there is another topic that Ihave
> never seen anything written about that I am curious about.((n^n)-1)/(n-1)
> I know from tables of generalised repunit primes that
> is prime for n = 2, 3, 19 and 31 and for no other n up to 1,000. Isfor
> there a theorem that could show these four numbers to be the only n
> which ((n^n)-1)/(n-1) is prime?[I am
> Also, when was the primality of 19^19-1/18 and 31^31-1/30 proved?
> curious]The next value of n that yields a probable prime is 7547. See
sequence A088790 has more information.
- << Previous post in topic Next post in topic >>