## Period Prime Test

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• If 1/n has the period n-1 then n is prime(n is a natural number). Of cf course there exist primes for them the condition don t hold. But if it hold, n must be
Message 1 of 2 , Nov 15, 2006
If 1/n has the period n-1 then n is prime(n is a natural number). Of
cf course there exist primes for them the condition don't hold. But if
it hold, n must be prime.

Is this true?
Is this a new primality test?
• ... ^ The decimal expansion of ... It s closely related to well-known primality tests. Basically it checks the order of 10 modulo N. If the order is N-1, then
Message 2 of 2 , Nov 15, 2006
--- youareprime <hugoplatzer@...> wrote:
> If 1/n has the period n-1 then n is prime(n is a natural number). Of
^ The decimal expansion of
> cf course there exist primes for them the condition don't hold. But if
> it hold, n must be prime.
>
> Is this true?
> Is this a new primality test?

It's closely related to well-known primality tests.
Basically it checks the order of 10 modulo N. If the order is N-1, then the
number is definitely prime.

Phil

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