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What is the definition of a prime number/ - Mathsoft Computers & Internet

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A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number

Posted on Jun 03, 2014


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Posted on Jan 02, 2017


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Define a prime number

A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. Read on at the link.

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Here we go
52 - can be divided by 2 - therefore NOT Prime
63 - can be divided by 3 - therefore NOT Prime
75 - can be divided by 5 - therefore NOT Prime
31 - cannot be divided by whole numbers - therefore Prime
77 - can be divided by 7 - therefore NOT Prime
59 - cannot be divided by whole numbers - therefore Prime
87 - cannot be divided by whole numbers - therefore Prime
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Mar 08, 2015 | Computers & Internet

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I would like to cancel Amazon Prime trial offer for free before I am charged the $99.00 charge

Sign into and then mouse-over "Your Account" in the top right of the screen. Click "Your Prime Membership". That will bring up your Prime information. On the left will be a link to "End Membership". Though, if you do order from Amazon a lot, and use their video streaming service, the Prime is definitely worth it. At least to me it is :-)

Oct 28, 2014 | Computers & Internet

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Why is 1 not a prime number

The common definition is a number only divisible by 1 and itself. This has redundancy for 1, and does not apply.

More formally, The Fundamental Theorem of Arithmetic Every positive integer greater than one can be written uniquely as a product of primes, with the prime factors in the product written in order of nondecreasing size.
So 1 is left out.

Jun 06, 2014 | Computers & Internet

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I cant understand prime numbers

A prime number is a positive whole number (natural number) which cannot be divided into smaller whole numbers. In short, it can only be divided (integer division) by itself and 1.
First prime number is 2, then 3, 5, 7, 11, 13, 17, 19,
To generate a list of prime numbers the Greek Eratoshenes used a method called now the sieve Eratosthenes.

  1. Write all the natural numbers up to some chosen limit (100, 259, any limit )
  2. Remove 1 by crossing it ( 1 is no longer considered prime).
  3. The first prime number is 2. Circle the number 2.
  4. Go through the whole list crossing out all the numbers that are multiple of 2, that is 4, 6, 8,10,12, ...
  5. Repeat.
  6. The next prime number is 3 since it was not crossed out as a multiple of 2. Circle 3.
  7. Go through the whole list crossing all the numbers that are multiples of 3, and which have not already been crossed out as multiples of 2 .
  8. Number 4 has been crossed out already.
  9. Next prime number is 5. Circle 5
  10. Go through the whole list crossing all the numbers that are multiple of 5 and which have not been crossed out already as multiples of 2, or 3
  11. Repeat:
  12. Next prime number is 7. Circle 7
  13. Go through the whole list again, crossing out the multiples of 7, and so on.
If you want to test the primality of a positive integer (odd number) starting by dividing it by 3 (use divisibility rules or otherwise), then divide by 5, by seven, and all subsequent prime numbers. If it is not divisible by any prime number, keep going but do not exceed the prime number that is closest yet smaller than square root of your number.


Nov 26, 2013 | Office Equipment & Supplies

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How to explain that all numbers ending with 1,3,5,7,9 are prime other words can I say that all odd numbers are prime numbers?

No not all odd numbers are prime numbers. A prime number is one that cannot be divided equally by any other number then itself or 1. Therefore numbers such as 9 is not a prime number because it can also be evenly divided by 3Hope this answers your question. Thank you.

Aug 15, 2011 | Home

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Hello. I was given the coffee maker below for Christmas. Unfortunately I find it a bit of a nightmare to use and I definitly will have to return it to John Lewis if I cannot overcome the problem...

To prime machine run the hot water cycle, press the button for hot water and open the steam knob until you get a nice flow of water. It is possible that you grind is too fine, try adjusting it coarser by 2 numbers.

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What is the torque on the pump bolts and how do i prime the pump

mounting bolts 70 ftlbs as far as primeing use some white lube on the gears it will catch its prime

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What are the factors of 72

hello. now you are making me think about something that i have not thought about in many years.

72 is a composite number because it has factors other than 1 and itself., It is not a prime number.

The 12 factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.
The factor pairs of 72 are 1 x 72, 2 x 36, 3 x 24, 4 x 18, 6 x 12, and 8 x 9.

The proper factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, and 36 or,
if the definition you are using excludes 1, they are 2, 3, 4, 6, 8, 9, 12, 18, 24, and 36. The prime factors of 72 are 2, 2, 2, 3, and 3.

Sep 09, 2009 | 2007 Ridley Auto Glide Old school

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