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2 can be added to 5: 2+5 = 7

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Q: What prime number can be added to 5 so that the sum can be a prime number?

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Yes.The sum of any six prime numbers, excluding 2, will be even. So the sum will be composite.

289 is an odd number so it must be the sum of an odd and an even number. The only even prime number is 2 so the other number must be 287, which is not prime as it is divisible by 7, so your question has no answer in this universe.

ok so this is a little hard umm... the 10th prime number is let's see: 1,2,3,5,7,11,13,17,19,23 <------ 23 And the 10th composite number is: 4,6,8,9,10,12,14,15,16,18<------- 18 SO 23 plus 18 ISSSSSS........... 41 So the sum of the 10th prime number and the 10th composite number is 41!!! * * * * * 1 is neither prime nor composite. So the tenth prime is actually 29 and the sum is 47.

No The sum of the digits is 12 so the number divides by 3.

1617 is not a prime number. The sum of its digits is a multiple of 3, so 3 is one of its factors. A prime number has exactly two factors, 1 and the number itself, so 1617 is a composite number.

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Yes.The sum of any six prime numbers, excluding 2, will be even. So the sum will be composite.

289 is an odd number so it must be the sum of an odd and an even number. The only even prime number is 2 so the other number must be 287, which is not prime as it is divisible by 7, so your question has no answer in this universe.

There are not three prime numbers that have the sum of 3. The smallest prime number is 2. If all three prime numbers were 2, the sum would 2 + 2 + 2 = 6, so that is the smallest number that is the sum of three prime numbers.

No. The sum of two odd numbers is always even, and no prime is even (apart from 2, but it is the lowest prime, so no primes can be added to form it).

ok so this is a little hard umm... the 10th prime number is let's see: 1,2,3,5,7,11,13,17,19,23 <------ 23 And the 10th composite number is: 4,6,8,9,10,12,14,15,16,18<------- 18 SO 23 plus 18 ISSSSSS........... 41 So the sum of the 10th prime number and the 10th composite number is 41!!! * * * * * 1 is neither prime nor composite. So the tenth prime is actually 29 and the sum is 47.

Yes, but since 2 is the only even prime number and the sum of two odd numbers is always even, one of the two prime numbers being added will always be a 2. So, for example: 3 + 2 = 5 11 + 2 = 13 71 + 2 = 73

316 + 513 = 829 which is a prime. So the smallest prime number dividing it is 829.

No The sum of the digits is 12 so the number divides by 3.

1617 is not a prime number. The sum of its digits is a multiple of 3, so 3 is one of its factors. A prime number has exactly two factors, 1 and the number itself, so 1617 is a composite number.

47 is odd, so it is sum of even and odd. The only prime even number is 2, but corresponding 45 isn't prime. So may be 0 + 47? :) Of course, it is valid for a 10-base calculations

The prime numbers between 40 and 50 are 41, 43, 47. So their sum is 131.

No, it is not.Incidentally, is a number p is prime then its 2 factors are 1 and p. Their sum is p+1.If p is a perfect number then this sum must be 2p.That is, p+1 = 2p or p = 1.But 1 is not a prime. So no prime can be a perfect number and since 13 is prime, it cannot be a perfect number.

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