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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.
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संबंधित प्रश्न
What are prime numbers? Give ten examples.
What are composite numbers? Can a composite number be odd? If yes, write the smallest odd composite number.
Express the following odd number as the sum of three odd prime number:
31
Express the following odd number as the sum of three odd prime number:
49
Write seven consecutive composite numbers less than 100 having no prime number between them.
Which of the following are co-primes?
Which of the following numbers is not a prime?
Express the following number as the sum of three odd primes:
31
Write five pairs of prime numbers less than 20 whose sum is divisible by 5. (Hint : 3 + 7 = 10)
Prime numbers do not have any factors.
