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In 1741 Christian Goldbach conjectured that every even number could be written as a sum of two primes. [At the time 1 was considered a prime and so 2 = 1 + 1.] The conjecture has not been proven so there may be even numbers which cannot be so written. Also every number which is greater than 5 and is one fewer than a multiple of 6 cannot be so written.
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What are two composite numbers whose prime factors have a sum of 18?
65 and 77
What are two composite numbers that each have prime factors with the sum of 10?
21 and 32
What numbers are prime numbers and what numbers are composite?
Prime numbers have two factors, composite numbers have more than two.
What does prime composite mean?
Prime numbers have two factors; composite numbers have more than two.
Does the sum of two prime numbers equal a prime number?
If one of the two numbers is 2, the sum of two prime numbers may sometimes be a prime number. Examples of this are 2 + 11 = 13, 2 + 521 = 523, 2 + 281 = 283. There are an infinite number of similar examples where the sum of 2 plus a prime is another prime. However if neither number is 2, then the sum of two prime numbers is always an even number greater than 2 and therefore composite.
If you add a prime number to itself is the the sum composite or prime?
The sum of two prime numbers will be composite unless one of the prime numbers is 2.
Is the sum of any two prime numbers always a composite number?
The sum of any two prime numbers is not always a composite number. The sum of 2 and 11 is 13, and 13 is a prime number, not a composite number.
What is the term for the sum of two prime numbers?
composite
When adding 2 prime number will the answer be prime?
The sum of any two prime numbers may or may not be prime. The sum of the two prime numbers 2 and 3 is the prime number 5, and the sum of the two prime numbers 5 and 7 is the composite number 12.
Are composite numbers closed under addition?
No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.
Is the sum of two composite numbers also composite?
Not always as for example 20+9 = 29 which is a prime number
What two composite numbers whose prime factors have a sum of 10?
4nd 9.
What are two composite numbers whose prime factors have a sum of 18?
65 and 77
What are two composite numbers that each have prime factors with the sum of 10?
21 and 32
Find two composite numbers whoose prime factors have a sum of 18?
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Is the product of two prime numbers composite or prime?
The product of two prime numbers will be composite.
What numbers are prime numbers and what numbers are composite?
Prime numbers have two factors, composite numbers have more than two.
