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Q: What are two prime numbers less than 20 whose sum is also a prime number?

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3, 5, and 7 are three prime numbers whose average is 5.

There are infinitely many prime numbers, and also infinitely many twin primes so there is no answer to the question.

2

"emirp" is "prime" spelled backwards. An emirp number is a prime number whose reverse is also a prime. However, palindromic primes are excluded. So 13 / 31 are emirp numbers.

The only even prime number is 2.

73 satisfies your condition.

4

Yes, every prime number, except for the number 2, is odd.

30 has three prime numbers and is a factor of 60.

False because 2 is an even number which is also a prime number.

23

2 + 3 = 5 2 + 5 = 7 2+ 11 = 13 2 + 41 = 43 The numbers only work with 2 because adding odd numbers together equals an even number. 2 is the only even prime number and thus adding any other prime numbers together will not equal a prime.

Sometimes.2 + 3 = 5 (prime number)5 + 7 = 12 (not a prime number)

The smallest prime number in which all of the digits are also prime is 2.The smallest multi-digit prime number in which all of the digits are also prime is 23.

No because 2 is an even number which is also a prime number

Prime numbers are related with composite numbers as they are both natural numbers and real numbers and also every composite number is a product of prime numbers due to which they are related with each other.For example 24=[2] [2] [3] [2].Here 24 is a composite number,real number and natural number and 2,2,3,2 are prime numbers and also they are real and natural numbers

No. A prime number is a number that can only be divided by itself and 1. The first prime number is 2 - which is also the only even prime number. The prime numbers from 1 - 20 are: 2 and 3 and 5 and 7 and 11 and 13 and 17 and 19

Numbers divisible by 1 & number itself are called prime numbers. These numbers also have the property to be odd numbers.

the only prime number that is even is 2. all of the other positive even numbers can be divided by 2. negative numbers aren't considered prime.

It tells you if a number is prime or composite and it also gives you a few factors of the number.

34 = 2 x 17 which are both prime numbers

The only even prime number is 2.

5 is a prime factor of both numbers.

No other prime numbers are consecutive because there aren't any other even prime numbers.

Any two prime numbers, eg 3 and 17 also any two co-prime numbers eg 26 and 33