Mention at least ten pairs of co-prime numbers between 1 and 100 .
The pairs of co-prime numbers between 1 and 100 are 2,3 , 3,5 , 5,7 , 11,13 , 13,14, 17,19 , 21,22 ,28,57 , 29,31 ,41,43 , 59,61 , 71,73 , 87,88 , 99,100
Hence, the required at least ten pairs of co-prime numbers are 2,3 , 3,5 , 5,7 , 11,13 , 13,14 , 17,19 , 21,22 , 28,57, 29,31 , 41,43
If two numbers are co-primes, at least one of them must be prime.
The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3. Find such pairs of prime numbers upto 100.