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Nope

do you mean a formula to verify if it is prime?

Yes.....

Sieve of Eratosthenes is a good place to start if you want to research this area

i can come up with a formula impromptu....o.O

but yeah...there isnt any im familiar of

Easiest way: check if it's divisible by any natural number or not :P

Trust me the number theorists would love if there was an easy formula to verify primality :P

So far, there isn't. If there was the Reimann Hypothesis wouldn't be as big of a deal as it is.

I see something interesting. http://en.wikipedia.org/wiki/Lucas%E2%80%93Lehmer_primality_test

Yeah parth that is for Mersenne primes only, though

^ spam. It didnt help

are you good now @shahzadjalbani ?

or just divide by the primes

20/2 wields a quotient with no remainder so it is automatically not prime

Obviously 20 isn't prime, lgba, that was not the point of the example.

i was giving an eample too...of my method

makes sense...