Primeq and primaility check

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I'm new in high mathematics. So I am writing a program for android. It is working offline and it is about math. In my program the biggest number is the biggest number your device can understand. I mean if tomorrow they make a android phone that has very powerful processor then you can get and use a much more bigger number.

My questions is. How is working PrimeQ and which is the fastest way to check if the number is prime or not for sure, not probably.

What I have tried:

Right now I'm using simplest way. Brute force till √(n) . Where n is the entered number. I can send apk if you need.

Thanks...

Posted 31-Jul-17 8:03am

Member 13294470

Updated 31-Jul-17 20:57pm

Afzaal Ahmad Zeeshan

v4

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Patrice T · Answer 1 · 2017-07-31T08:58:00

You absolutely need to learn Google.
There huge amount of information about primality and factorization.

Quote:
In my program the biggest number is the biggest number your device can understand.

Most languages can handle BigInt numbers (virtually infinite integers).

Quote:
My questions is. How is working PrimeQ

You only forgot to tell us the language you use. Using Google and reading documentation will probably give you many informations about this, faster than us and with much more details.

CPallini · Answer 2 · 2017-07-31T20:57:00

Solution 3

The starting point could be the Wikipedia page[^] on the topic.

Posted 31-Jul-17 20:57pm

CPallini