Question about Computers & Internet
What is a prime number? How do I recognize a prime number? what makes 7, for instance, a prime number?
Posted by Anonymous on
It is any number only divisible by itself and 1 (giving whole number results). A list here of the first 1000
Posted on May 07, 2014
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Posted on Jan 02, 2017
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2) Cross off number 1, because all primes are greater than 1.
3) Number 2 is a prime, so we can keep it, but we need to cross off the multiples of 2 (i.e. even numbers).
4) Number 3 is also a prime, so again we keep it and cross off the multiples of 3.
5) The next number left is 5 (because four has been crossed off), so we keep it and cross of the multiples of this number.
6) The final number left in the first row is number 7, so cross off its multiples.
7) You have finished. All of the "surviving" numbers (coloured in white below) on your grid are prime numbers.
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