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Are odd numbers cannot be written as sum of prime numbers?
Some odd numbers can be written as the sum of prime numbers. 2 + 3 = 5
What different between odd number and prime number?
While all prime numbers are odd (except 2), not all odd numbers are prime. 9 for example is an odd number, but you can get it by multiplying 3X3, so it is not prime. Odd numbers are numbers that are not divisible by 2. Prime numbers are numbers that cannot be generated by multiplying 2 whole numbers besides 1 and itself.
How many of the prime numbers between 10 and 20 can be written as the sum of two primes?
All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
Can the number 23 can be written a sum of two prime numbers?
No, it cannot be done. As 23 is odd, two numbers used would have to be one odd and one even. As 2 is the only even prime number and 21 + 2 equals 23, but 21 is not a prime number, it cannot be done.
Why odd numbers have lots of prime numbers?
The only even prime is 2. The rest are all multiples of 2, and thus cannot be prime.
Are all odd numbers prime numbers?
No because 2 is an even number which is also a Prime number that has only two factors which are itself and one.
Why are not all odd numbers greater than 3 are prime numbers?
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
Are there more odd numbers or prime?
odd numbers
Why is odd numbers not prime?
Some are, but some have more than two factors and cannot be.
Are there more even prime numbers or odd prime numbers?
All prime numbers are odd, exept of the first prime number 2.
Are more number prime or odd?
There are more odd numbers than prime numbers.
Which numbers can be expressed as the difference of the squares of two whole numbers?
I am not sure there is such a classification. It cannot be odd/even Odd numbers: 52 - 22 = 21 Even numbers: 52 - 32 = 16 It cannot be prime/composite Prime: 32 - 22 = 5 Composite: 52 - 22 = 21
