The numbers 13 and 31 are prime numbers. Both these numbers have the same digits 1 and 3. Find such pairs of prime numbers up to 100.

Prime numbers are the numbers that have only two factors, that are, 1 and the number itself.

Answer: The pairs of such numbers are:

• 17 and 71

• 37 and 73

• 79 and 97

We will show the prime number chart to answer this question.

Explanation:

The prime numbers from 1 to 100 are shown in the number chart below.

Clearly, the numbers 17, 71, 37, 73, 79, and 97 are prime numbers.

So, the pairs of such numbers are:

• 17 and 71

• 37 and 73

• 79 and 97