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Math: Number Theory

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Re: Math: Number Theory [#permalink] New post 09 Feb 2014, 08:07
any body can explain that why we need to find the sum of number's factors ????
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Re: Math: Number Theory [#permalink] New post 01 May 2014, 06:50
Thanks for the post!! So helpful!
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Re: Math: Number Theory [#permalink] New post 21 Jun 2014, 03:08
Hi Bunuel,
You can change this section to.

Verifying the primality (checking whether the number is a prime) of a given number n can be done by trial division, that is to say dividing n by all integer prime numbers smaller than \sqrt{n}, thereby checking whether n is a multiple of m<\sqrt{n}.
Example: Verifying the primality of 161: \sqrt{161} is little less than 13, from integers from 2 to 13, 161 is divisible by 7, hence 161 is not prime.

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Re: Math: Number Theory   [#permalink] 21 Jun 2014, 03:08
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