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If you pick any number, you have to go through all the possible divisors to see if they work.
A better way was invented by the ancient Greek, Eratosthenes. Write down all the numbers 3 to 999 (we know all primes are odd numbers). Then go through the 3x multiplication table crossing out all the multiples of 3 from the list. Do the same with 5, then 7, then 11 etc. After you have gone through all those up to 31, the numbers left in your list are all prime.
It isn't difficult to programme a pc to calculate Prime number with this method and my laptop calculated prime numbers up to 1 million in about 2 seconds :)
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What 2 prime numbers make 95?
There is a difference of 95 when the prime number 2 is subtracted from the prime number 97.
What name is given to prime numbers that you can reverse to make another prime number?
A mirror prime.
Is the number 63 a prime number or a composite number?
The number 63 is not a prime number as it can be divided by 3 to make 21 as well as it self and one
What three prime numbers make 251?
None. 251 is a prime number.
What prime number makes 469?
A prime number does not 'make' any other number. It may be a factor of a number., if so then there will be at least one other number.
How do you make 10 prime?
You cannot make any composite number prime number because prime only has 2 factors.
How do you make 90 a prime number?
90 is not a prime number and you cannot make it one!
How do you make 177 prime?
If it is composite, you can not make a number prime.
How do you make composite prime?
You cannot. By definition, a composite number is not prime and you cannot make it prime.
How do you make 56 a prime number?
A composite number cannot be made into a prime number. The prime factorization of 56 is 2x2x2x7 or 23x7.
How do you make 14 a prime number with a exponent?
It is: 14^0.262649535 = 2 which is a prime number
Why will a prime number times a prime number always equal a composite number?
the two prime numbers will be factors of that number, which would make that number a composite number
What 2 prime numbers make 95?
There is a difference of 95 when the prime number 2 is subtracted from the prime number 97.
How many Five number 357 prime number?
The question isn't clear. "Five number 357 prime number" doesn't make sense.
How do you make 105 into a prime number?
105 is not a prime number. If you say that 105 is a number written in base 6, it is the same as 41 in base 10, which is a prime number.
What prime numbers make 7?
7 is a prime number; its only prime factor is 7.
What name is given to prime numbers that you can reverse to make another prime number?
A mirror prime.
