0
One set is: 2+7+11 = 20
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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.
What prime number less than 20 can be written as a sum of differrent primes?
2 + 3 = 5
What is the sum of all primes between 20 and 60?
23+29+31+37+41+47+53+59 = 320
How many increasing sequences of three distinct prime numbers have a sum of 20?
List the primes up to 20 (2, 3, 5, 7, 11, 13, 17, 19) and note that the largest possible prime in the sum is 13 because no two primes add up to and of course 19 is too large as well. Also, observe that 2, the only even prime, must be in the sum, because the sum of three odd primes cannot never be 20. Starting with 2 and 3, we see that is not prime. Next, 2 and 5 give , a prime, so one such increasing sequence is 2, 5, 13. Next, we take 2 and 7, and we see that is prime as well, giving us the second sequence 2, 7, 11. 11 and 13 are already included, so we are done. Thus, there are increasing sequences of three distinct prime numbers that have a sum of 20.
What is the sum of all prime numbers between 10 and 20?
The primes between ten and twenty are 11, 13, 17 and 19. Adding them together gives 60.
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.
What prime number less than 20 can be written as a sum of differrent primes?
2 + 3 = 5
What is the sum of all primes between 20 and 60?
23+29+31+37+41+47+53+59 = 320
What prime numbers less than 20 can be written as a sum of different primes?
5, 7, 13, 17 and 19 can be so written.
How many primes are there in between 0 and 20?
There are 9 prime numbers between 0 and 20: 1,2,3,5,7,11,13,17,19.
How many increasing sequences of three distinct prime numbers have a sum of 20?
List the primes up to 20 (2, 3, 5, 7, 11, 13, 17, 19) and note that the largest possible prime in the sum is 13 because no two primes add up to and of course 19 is too large as well. Also, observe that 2, the only even prime, must be in the sum, because the sum of three odd primes cannot never be 20. Starting with 2 and 3, we see that is not prime. Next, 2 and 5 give , a prime, so one such increasing sequence is 2, 5, 13. Next, we take 2 and 7, and we see that is prime as well, giving us the second sequence 2, 7, 11. 11 and 13 are already included, so we are done. Thus, there are increasing sequences of three distinct prime numbers that have a sum of 20.
Write 20 as a product of primes?
20 as a product of primes = 2 * 2 * 5
How many sets of numbers go into 20?
Three sets
How many sets of 20 meter lengths to a mile?
80.46 sets
What is the sum of all prime numbers between 10 and 20?
The primes between ten and twenty are 11, 13, 17 and 19. Adding them together gives 60.
How many sets of 20 in 800?
4
Which of the following cannot yield an integer when divided by 10?
All of these could yield an integer when divided by 10. 1. sum of two integers: ( 10 + 10)/10 = 2 2. integer less than 10: -20 < 10 and -20/10 = -2 3. product of 2 primes: 2 and 5 are primes and 2*5/10 = 1 4. sum of three consecutive integers ; (9+10 + 11) /10 3
