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प्रश्न
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.
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उत्तर
17 and 71,
19 and 91,
37 and 73
79 and 97
There are required pairs of numbers up to 100.
संबंधित प्रश्न
Write all the prime numbers between:
10 and 40
What are composite numbers? Can a composite number be odd? If yes, write the smallest odd composite number.
Are co-primes always primes? If no, illustrate your answer by an example.
State the following statement is True or False.
If a number is prime, it must be odd.
Show that the following pairs are co-primes:
512, 945
Which of the following are co-primes?
Every natural number is either prime or composite
The sum of three prime numbers is 80. The difference of two of them is 4. Find the numbers
Which of the following number is prime?
23
Express the following number as the sum of three odd primes:
21
