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Is there an even number which can be written as the sum of four odd primes?
Wiki User
∙ 13y ago
Prime numbers can only be odd, otherwise they'd be divisible by two, and thus not prime. But, as an example: 1 x 3 x 5 x 7= 105. (odd) An odd times an odd is always odd. Since primes are by definition odd, one cannot multiply four prime numbers and get anything other than an odd number, as each step produces an odd number. Thus a multiplicative sum of four primes is always odd. If by a sum you actually mean addition, then anytime you add two odd numbeers you get an even number, so any four prime numbers will give you an even result every time, and one answer is above. I assume you are only dealing with real numbers.
Another Answer:
Except for the number 2, which is even and prime, all prime numbers are odd. The sum of any two odd numbers is even, and the sum of any two even numbers is even, so the sum of any four odd numbers is also even. There are an infinite number of even numbers that can be written as the sum of four odd prime numbers. The first example is 3 + 5 + 7 + 11 which equals 26 or, in the full case, 3 + 3+ 3 + 3 which equals 18.
Wiki User
∙ 13y ago
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What number is between a pair of twin primes and has exactly 4 factors?
Six has four factors and is in between the twin primes 5 and 7.
The prime factors of a number are the first four prime numbers No factor is repeated What is the number?
210 is the number whose prime factors are the first four primes unrepeated.
Why do you get an even number when you multiply by four?
because four is an even number
What is the largest four digit odd number whose four digits are even?
There is no such number. If the four digits are even, the entire number is even, not odd.
Is the number 188 prime or composite?
He is composite, by factorisation of 188: 2* 94 --> 188 Very obvious ... The primes can only have one of the four digits below to be considered a prime number: 1, 3, 7 and 9 The two are the only even number that is prime.
Is there a number from 1 to 100 that is divisible by four different primes?
no the smallest number that is divisible by four different primes would be 210
What number is between a pair of twin primes and has exactly 4 factors?
Six has four factors and is in between the twin primes 5 and 7.
The prime factors of a number are the first four prime numbers No factor is repeated What is the number?
210 is the number whose prime factors are the first four primes unrepeated.
How many primes factors does the number 189 have?
Two distinct prime factors, four altogether.
Why do you get an even number when you multiply by four?
because four is an even number
Is the number 188 prime or composite?
He is composite, by factorisation of 188: 2* 94 --> 188 Very obvious ... The primes can only have one of the four digits below to be considered a prime number: 1, 3, 7 and 9 The two are the only even number that is prime.
What is the largest four digit odd number whose four digits are even?
There is no such number. If the four digits are even, the entire number is even, not odd.
How many prime numbers from 11 to 100 are there whose digits when interchanged give a prime number?
There are four pair of mirror primes.
What is the smallest sum of 4 prime numbers that is itself a prime number?
The first four primes have this property: 17 = 2 + 3 + 5 + 7 (all primes). So does 23 (2+3+7+11)
What numbers are divisible by four prime numbers?
2 * 3 * 5 * 7 = 210 is the smallest one divisible by four unique prime numbers. However, there are an infinite number of them, since there are an infinite number of primes.
What is a number that has four identical even factors?
16 is a number that has four identical even factors.
What are facts about number four?
four is a even number. it is the 3rd digit of pie
