They are prime numbers when you reverse the first one, the second one is prime also.
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Mirror primes are pairs of prime numbers whose digits are reversed. (13,31)(17,71)(37,73)(79,97)
There are four pair of mirror primes.
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
11 13, 31 17, 71 37, 73 79, 97
Products of prime numbers are composite numbers.