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There is no formula which will always calculate a Prime number for you. However, there are schemes for finding all the primes. The oldest is called the Seive of Eratosthenes. To find all the prime numbers between 1 and 1000,, for example, you first go through the list crossing off every other number -- these will be all the even numbers. Then you go through the remaining list crossing off every third number. Next you go through the remaining list crossing off every 4th number. Next you go through the remaining list crossing off every n th number, where n starts at 5 and goes to 499. At that point, the numbers remaining on your list are all primes. For example to find the primes between 1 and 10: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10 1, 3, 5, 7, 9 1, 5, 7 These are the primes between 1 and 10.

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Q: How do you calculate a prime number?
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Related questions

How do you calculate prime numbers and what you mean by prime number?

Prime numbers have only two factors, one and themselves. The number 5 is prime.


How would you work out what number has 15 factors?

I would pick any prime number and calculate it to the 14th power.


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Prime numbers have two factors, composite numbers have more than two.


How do you calculate number of prime number between 1 and 1000?

There is no simple way since there is no known pattern for the exact distribution of primes. You just have to go and check each number to see whether or not it is a prime.


How do you calculate first ten prime numbers?

You go through each number, starting with 2, 3, 4, ... and check if the number has any smaller factors. If it has no smaller factors, you conclude it is a prime number. Continue until you have 10 prime numbers.


How do you find out if 123 is a prime number?

To calculate manually if any number is a prime number, divide the number by ascending prime numbers until you reach the square root of the number. In this instance: 123/2 = 61.5 123/3 = 41 Therefore, 123 is not a prime number. However, since the first two factors we discovered are both prime - those being 3 and 41, it must not have any other factors.


What number is a square number but not a prime number and is less than 100?

No square number is a prime number, since it has the number you squared as a factor. There are several square numbers less than 100. Just calculate the squares of all numbers, starting with 1, until you reach or pass 100. Then stop.


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