-18
71 - 53 = 18
The greatest common factor of 53 and 71 is 1. Both numbers are prime.
37.63
The gcf of 53 and 71 is 1 - b'cos 53 is a prime ( so is 71)
71 is not a factor of 5141. 5141 = 53 * 97.
53, 57, 59, 61, 67, 71, 73
3, 31, 53, and 71 are primes; 35 is composite, having the factors 1, 5, 7, and 35.
47, 53, 59, 61, 57, 71, 73, 79
57
58
53 59 61 67 71 73 79 83 89 97.
All the prime numbers 50 through 75 are: 53, 59, 61, 67, 71, and 73.